de ham khao

<span class='text_page_counter'>(1)</span>Họ và tên: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lớp8: . . . . . . . . . . . . . . . . . . . . . . . .. KIỂM TRA CHƯƠNG I MÔN: Đại số (Thời gian 45 phút ). Điểm. C. ĐỀ BÀI I. Trắc nghiệm (3đ) : Hãy khoanh tròn vào chỉ một chữ cái đứng trước câu trả lời đúng : Câu 1: Kết quả của phép tính (x - 3y).(x - 3y) bằng : A. x2 - 9y2 B.x2 - 6xy + 9y2 C.x2 + 9xy + 9y2 D. Kết quả khác Câu 2: Rút gọn biểu thức A. 450. 9002 bằng : 4522 −448 2. B. 225. C. 252. 1. D. 2. Câu 3: Cho x3 - x = 0 . Giá trị của x sẽ là : A. x = 0 ; x = 1 ; x = -1 B. x = 0; x = - 1 C. x = 0; x = 1 D.Một đáp số khác Câu 4: Câu nào sau đây sai : A. (x - 2)3 = (2 - x)3 B. (x + 1)3 = (1+ x)3 C. (x - 2y)2 = (2y - x)2 D. (x - 3)3 = x2 - 6x + 9 Câu 5 : Giá trị của biểu thức x3 - 6x2 + 12x - 8 tại x = 12 là : A. 1000 B. 1200 C. 1400 D. 1800 n+1 n Câu 6 : Biểu thức 14 - 14 ( Với n là số tự nhiên ) chia hết cho : A. 11 B.23 C.13 D.17 II. Tự luận : (7đ ) Câu 1 :(3đ) Phân tích các đa thức sau thành nhân tử : a) 2x - 4y b) x2 - y2 + 6x + 6y c) y3 - 4y2 + 3y d) x2 - 5 Câu 2 : (2đ)Tìm x: a/ x3 -16x = 0 b/ 7x(x-3) –x +3=0 Câu 3: Rút gọn: (2x +1)(4x2 -3x +1) + (2x -1)(4x2 +3x +1) Câu 4 : Chứng minh rằng : x2 + x + 2 > 0 với mọi giá trị của x ............................................................................................................................................................................................................................................................................................................... .............................................................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................................................... .............................................................................................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................... ............................................................................................................................................................................................................................................................................................................... ............................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................ .............................................................................................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................................................................................. ................................................................................................................................................................................................................................................................................................ ...............

<span class='text_page_counter'>(2)</span> ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ............................................................................................................................................................................................................................................................................................... ............ ............................................................................................................................................................................................................................................................................................... ............ ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... .............................................................................................................................................................................................................................................................................................. ................ .............................................................................................................................................................................................................................................................................................. ................ ........................................................................................................................................................................................................................................................................................... ................... ............................................................................................................................................................................................................................................................................................... .............. ................................................................................................................................................................................................................................................................................................ ............. ............................................................................................................................................................................................................................................................................................. ................. ................................................................................................................................................................................................................................................................................................ .............. ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ .............. ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ ............. .............................................................................................................................................................................................................................................................................................. ............... ................................................................................................................................................................................................................................................................................................ .............. . ........................................................................................................................................................................................................................................................................................................... ... ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................... ............................................................................................................................................................................................................................................................................................................ .............................................................................................................................................................................................................................................................................................................. ... Họ. và tên: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. KIỂM TRA CHƯƠNG I. Điểm.

<span class='text_page_counter'>(3)</span> ... Lớp 8A . . . . . . . .. MÔN: Đại số (Thời gian 45 phút ). ........ ......... D. ĐỀ BÀI I. Trắc nghiệm (3đ) : Hãy khoanh tròn vào chỉ một chữ cái đứng trước câu trả lời đúng : Câu 1: Kết quả của phép tính (x - 3y).(x - 3y) bằng : A.x2 + 9xy + 9y2 B. x2 - 9y2 C.x2 - 6xy + 9y2 D. Kết quả khác câu 2: Rút gọn biểu thức 1. 9002 bằng : 4522 −448 2. A. 2 B. 252 C. 450 D.225 Câu 3: Cho x3 - x = 0 . Giá trị của x sẽ là : A. x = 0; x = 1 B. x = 0; x = - 1 C.x = 0 ; x = 1; x = -1 D.Một đáp số khác Câu 4: Câu nào sau đây sai : A. (x - 3)3 = x2 - 6x + 9 B. (x - 2y)2 = (2y - x)2 C.(x + 1)3 = (1+ x)3 D.(x - 2)3 = (2 - x)3 Câu 5 : Giá trị của biểu thức x3 - 6x2 + 12x - 8 tại x = 12 là : A.1400 B. 1200 C. 1000 D. 1800 n+1 n Câu 6 : Biểu thức 14 - 14 ( Với n là số tự nhiên ) chia hết cho : A. 11 B.13 C.17 D.23 II. Tự luận : (7đ ) Học sinh làm bài ở mặt sau bảng đề. Câu 1 : Phân tích các đa thức sau thành nhân tử : a) 2x - 4y b) x2 - y2 + 6x + 6y c) y3 + y2 - 6y d) 6 – a4 Câu 2 : Tìm x: a/ 4x3 -16x = 0 b/ 8x(x-3) –x +3=0 2 2 Câu 3: Rút gọn: (3x +1)(9x -3x +1) + (3x -1)(9x +3x +1) Câu 3 : a) Chứng minh rằng : x2 + x + 1 > 0 với mọi giá trị của x. .Họ. và tên: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. KIỂM TRA CHƯƠNG I. Điểm.

<span class='text_page_counter'>(4)</span> Lớp 8A . . . . . . . . . . . . . . . . . . . . . . . .. MÔN: Đại số (Thời gian 45 phút ) F. ĐỀ BÀI. Bài 1: Thực hiện phép tính: (2 điểm) a) 4 x .(3 x 2 −2 x +7) b) (5x5 – 18 x3 +21x2) : 3x2 c) ( x 2+7 xy )(x – 5y).  3xy  x. 2. 2  y  . x2 y 3. d) Bài 2: Phân tích đa thức thành nhân tử (2 điểm) a) x 4 −9 x 2 b) 5x2 – 5xy + 7x - 7y c) x2 + 2xy + y2 -16 d) x 2+5 x +4 Bài 3: Tính nhanh giá trị của biểu thức: (3 điểm) a) E = 4 x 2 −4 xy + y 2 tại x = 4 và y = 38 b) F = y 3 +6 xy 2 +12 x 2 y+ 8 x3 tại x= 6 và y = 28 c) G = (2x + y)(y – 2x) + 4x2 tại x = –2011 và y = 10 Bài 3: Tìm x, biết: (2 điểm) a) 3x( x  2)  x  2 0 b).  3x  1. 2. 2.   2 x  3 0. Bài 4: Tìm a để đa thức x3 - x2 – 7x + a chia hết cho x - 3 (1 điểm) ............................................................................................................................................................................................................................................................................................................... .............................................................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................................................... .............................................................................................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................... ............................................................................................................................................................................................................................................................................................................... ............................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................ .............................................................................................................................................................................................................................................................................................................. .............................................................................................................................................................................................................................................................................................................. ................................................................................................................................................................................................................................................................................................ .............. ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ............................................................................................................................................................................................................................................................................................... ..........

<span class='text_page_counter'>(5)</span> Họ và Tên : . . . . . . . . . . . . . . . . . . . .. KIỂM TRA I TIẾT ( BÀI SỐ 1) MÔN: ĐẠI SỐ 8. Điểm. Lời phê của thầy cô giáo. Mã đề 2 I. PhÇn tr¾c nghiÖm (3®) Khoanh tròn chữ cái đứng trớc đáp án đúng trong các câu sau : C©u 1: KÕt qu¶ cña phÐp nh©n xy( x2+ x -1) lµ: A. x3y+ x2y - xy C. x3y - x2y+ xy; 3 2 B. x y - x y - xy D. x3y+ x2y+ xy; 2 Câu 2: Tìm x, biết x - 9 = 0 ta đợc: A. x = 9 ; B. x=3 C. x=3 vµ x = -3 ; D. x= -3 ; 4 2 4 Câu 3 : Kết quả của phép tính 9x y z : 3x y là : A. 3xyz B.3xy C. 3yz D.3xz 2 C©u 4: Kết quả của phép tính (x+3 )( x – 5x)là : A.x3 + 2x2 + 15x C. x3 - 2x2 + 15x 3 2 B. x - 2x - 15x D.x3 + 2x2 - 15x C©u 5: Kh«ng thùc hiÖn phÐp chia h·y khoanh trßn vµo các c©u cã phÐp chia hÕt trong c¸c c©u díi ®©y: A. 3x3y : 2xy B. (x3 + x2 + x) : x C. (x3y + x2z + xy) : xz C©u 6: Rót gän biÓu thøc: A = (x-2)(x+2) - (x-1)2 được kết quả là : A. 2x + 5 B. 2x - 5 C. 2x2 - 3 D. - 3 II. PhÇn tù luËn(7®) C©u 1 :(2 ®) Ph©n tÝch c¸c ®a thøc sau thµnh nh©n tö. a. 5x – 15x2 c) x3 + x2 + 2x 3 b. xy + 3xy d) x2 + 2xy + y2 -9 C©u 2 : (2®) T×m x biÕt : a) x(x - 2)- x + 2 = 0 b) x2 – 2x - 3 = 0 C©u 3 : (1,5®) Sắp xếp các đa thức theo luỹ thừa giảm dần của biến rồi làm tính chia : ( x3 - 5x + 4x2 - 20 ): ( x + 4) C©u 4: (1®) Chứng minh rằng với mọi số nguyên a thì (a + 2)2 - (a - 2)2 chia hết cho 2 Câu 5: (0,5đ). Tính giá trị của biểu thức M = x2 + y2 – xy với x + y = 39; xy = - 164.. Họ và Tên : . . . . . . . . . . . . . . . . . . . Lớp: 8A. KIỂM TRA I TIẾT ( BÀI SỐ 1). MÔN: ĐẠI SỐ 8. Điểm. Lời phê của thầy cô giáo.

<span class='text_page_counter'>(6)</span> ĐỀ BÀI 3. I. PhÇn tr¾c nghiÖm (3®) Khoanh tròn chữ cái đứng trớc đáp án đúng trong các câu sau : C©u 1: KÕt qu¶ cña phÐp nh©n xy( x2 + x – 1) lµ: A. x3y + x2y + xy; C. x3y – x2y – xy; B. x3y – x2y + xy; D. x3y + x2y – xy 2 Câu 2: Tìm x, biết x – 25 = 0 ta đợc: A. x = 25 ; B. x = 5 vµ x = -5 ; C. x = -5 ; D. x = 5 4 2 4 C©u 3 : Kết quả của phép tính 27x y z : 9x y là : A. 3xyz B.3xz C. 3yz D.3xy 2 C©u 4: Kết quả của phép tính ( x – 5x)(x + 3 ) là : A. x3 – 2x2 – 15x C. x3 + 2x2 – 15x B. x3 + 2x2 + 15x D.x3 – 2x2 + 15x C©u 5: Kh«ng thùc hiÖn phÐp chia h·y khoanh trßn vµo c©u cã phÐp chia hÕt trong c¸c c©u díi ®©y: A. -6x3y: 5xy B. (x3 + x2 + x): x2 C. (x3y + x2z + xy): xy C©u 6: Rót gän biÓu thøc: A = (x – 2)(x + 2) – (x – 1)2 được kết quả là: A. 2x2 – 3 B. - 3 C. 2x + 5 D. 2x – 5 II. PhÇn tù luËn(7®) C©u 1 : (2®) Ph©n tÝch c¸c ®a thøc sau thµnh nh©n tö. a) x3 + 2x + x2 b) x2 + 2xy – 9 + y2 c) x2 – 3xy – 10y2. d) x2 - 7 C©u 2 : (2®) T×m x biÕt : a) x(x – 2) – x + 2 = 0 b) x3 – 3x2 – 4x + 12 = 0 C©u 3 : (1,5®) Sắp xếp các đa thức theo luỹ thừa giảm dần của biến rồi làm tính chia : ( 4x2 – 5x + x3 – 20 ): ( x + 4) C©u 4 : (1,0®) Chứng minh rằng với mọi số nguyên a thì (a + 3)2 – (a – 3)2 chia hết cho 4 C©u 5 : (0,5®) Biết x + y = 10. Tìm giá trị lớn nhất của P = xy. ............................................................................................................................................................................................................................................................................................ ............ ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ........... .............................................................................................................................................................................................................................................................................................. ................ .............................................................................................................................................................................................................................................................................................. ................ ........................................................................................................................................................................................................................................................................................... ....................

<span class='text_page_counter'>(7)</span> ............................................................................................................................................................................................................................................................................................... .............. ................................................................................................................................................................................................................................................................................................ ............. ............................................................................................................................................................................................................................................................................................. ................. ................................................................................................................................................................................................................................................................................................ .............. ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ .............. ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ ........... ................................................................................................................................................................................................................................................................................................ ............. ................................................................................................................................................................................................................................................................................................ ............. .............................................................................................................................................................................................................................................................................................. ............... ................................................................................................................................................................................................................................................................................................ .............. . ........................................................................................................................................................................................................................................................................................................... ... ........................................................................................................................................................................................................................................................................................................ ........................................................................................................................................................................................................................................................................................................... ... ........................................................................................................................................................................................................................................................................................................ ... ........................................................................................................................................................................................................................................................................................................ ... ........................................................................................................................................................................................................................................................................................................ ... ........................................................................................................................................................................................................................................................................................................ ... ........................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................................

<span class='text_page_counter'>(8)</span> ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................................

<span class='text_page_counter'>(9)</span> ................................................................................................................................................................................................................................................................................................. Họ và tên: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lớp: . . . . . . . . STT . . . . . . . . . . . . . . . .. KIỂM TRA CHƯƠNG I Điểm MÔN: Đại số 8 (Thời gian 45 phút ) ĐỀ C I. Trắc nghiệm (3đ) : Hãy khoanh tròn vào chỉ một chữ cái đứng trước câu trả lời đúng : Câu 1: Kết quả của phép tính (x - 3y).(x - 3y) bằng : A. x2 - 9y2 B.x2 + 9xy + 9y2 C.x2 - 6xy + 9y2 D. Kết quả khác Câu 2: Cho x3 - x = 0 . Giá trị của x sẽ là : A. x = 0 ; x = 1 B. x = 0; x = - 1 C. x = 0; x = -1; x = 1 D.Một đáp số khác Câu 3: Rút gọn biểu thức A. 252. 9002 bằng : 4522 −448 2. B.225. C. 450. 1. D. 2 Câu 4 : Biểu thức 14n+1 - 14n ( Với n là số tự nhiên ) chia hết cho : A.13 B.23 C.11 D.17 3 2 Câu 5 : Giá trị của biểu thức x - 6x + 12x - 8 tại x = 12 là : A. 1800 B. 1200 C. 1400 D. 1000 Câu 6: Câu nào sau đây sai : A. (x - 2)3 = (2 - x)3 B. (x - 2y)2 = (2y - x)2 C.(x + 1)3 = (1+ x)3 D. (x - 3)3 = x2 - 6x + 9 II. Tự luận : (7đ ) Học sinh làm bài ở mặt sau bảng đề. Câu 1 : Phân tích các đa thức sau thành nhân tử : a) 2x - 4y b) x2 - y2 + 6x + 6y c) y3 + y2 -6 y Câu 2 : Tìm x: a/ 4x3 -16x = 0 b/ 8x(x-2) –x +2=0 Câu 3: Rút gọn: (3x -1)(9x2 +3x +1) + (3x +1)(9x2 -3x +1) Câu 4 : Chứng minh rằng : x2 + x + 1 > 0 với mọi giá trị của x ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................................

<span class='text_page_counter'>(10)</span> ................................................................................................................................................................................................................................................................................................. Họ và tên: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lớp: . . . . . . . . STT . . . . . . . . . . . . . . . .. KIỂM TRA CHƯƠNG I Điểm MÔN: Đại số 8 (Thời gian 45 phút ) ĐỀ D I. Trắc nghiệm (3đ) : Hãy khoanh tròn vào chỉ một chữ cái đứng trước câu trả lời đúng : Câu 1: Kết quả của phép tính (x - 3y).(x - 3y) bằng : A. x2 - 9y2 B..x2 + 9xy + 9y2 Cx2 - 6xy + 9y2 D. Kết quả khác 3 Câu 2: Cho x - x = 0 . Giá trị của x sẽ là : A.x = 0; x = - 1 B. x = 0 ; x = 1 C. x = 0; x = -1; x = 1 D.Một đáp số khác Câu 3: Rút gọn biểu thức A. 225. 9002 bằng : 2 2 452 −448. B. 450. C.252. 1. D. 2 Câu 4 : Biểu thức 14n+1 - 14n ( Với n là số tự nhiên ) chia hết cho : A. 23 B.17 C.13 D.11 3 2 Câu 5 : Giá trị của biểu thức x - 6x + 12x - 8 tại x = 12 là : A.1400 B. 1200 C. 1000 D. 1800 Câu 6 : Câu nào sau đây sai : A. (x - 2)3 = (2 - x)3 B. (x + 1)3 = (1+ x)3 C. (x - 3)3 = x2 - 6x + 9 D.(x - 2y)2 = (2y - x)2 II. Tự luận : (7đ ) Học sinh làm bài ở mặt sau bảng đề. Câu 1 : Phân tích các đa thức sau thành nhân tử : a) 2x - 4y b) x2 - y2 + 5x + 6y c) y3 +4y2 + 3y Câu 2 : Tìm x: a/ x3 -25x = 0 b/ 2x(x-5) –x +5=0 Câu 3: Rút gọn: (3x +1)(9x2 -3x +1) + (3x -1)(9x2 +3x +1) Câu 4 : Chứng minh rằng : x2 + x + 1 > 0 với mọi giá trị của x ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................................

<span class='text_page_counter'>(11)</span>