TRƯNG THCS HP THNH
ĐỀ THI CHỌN HỌC SINH GIỎI
MÔN: TOÁN 6
(Không kể thời gian giao đề)
Câu 1. a. Chøng minh sè say ®©y lµ sè chÝnh ph¬ng.
A = 44…4 x 88…8
≥

n ch÷ sè 4 (n-1) ch÷ sè 8
 !"#$%"&
Câu 2. (2 điểm): So sánh
&

$%!
!
'
#(
$%
)
#
#*
$%

Câu 3. (1 điểm): +,-.***

"'
#)
+/0-1,21,'
Câu 4. 34-5678#921:8!;$<=>71,
&21:8*;$<=>71,!21:8;$<=>
1,*?04-56%,@

Câu 5: +,#-232+1-3.!A-+.#A3+.#3-232+8B
%CD@E,@
FG&HIC#-232+,6=:?08GJ,,4B
K18GJ&&,4BJLG,HIC#-232+
,6=:
Câu 6:M+FKN&"#$%!OL%CP%,8
 @6,C,JQ)1*CD 
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M3KR?MSTK?MUKVMSWK
X?YKVVZ[\R]+E^_^\`\
HƯỚNG DẪN CHẤM THI CHỌN HSG
MÔN: TOÁN 6
Bài Đáp án Điểm
Câu 1
(2điểm)
)#("))a)'
.)#(")a)'
.)'a)'
.')a).'.'
2'
2'
2'
 ' )  !
) * * ) ##
 ' ) !
) * * ##
 ! 


) ## #
B
−
 
= × − × ×
 ÷
 
−
 
= × − ×
 ÷
 
= × × =
2'
2'
2'
   
 # ) )
   

)' '( (& '(
       

) ' ' ( ( & ' (
  # #
 
) ( ( !
C = + + +×××+
 
= + + +×××+

 ÷
 
 
= − + − + − +×××+ −
 ÷
 
 
= − = =
 ÷
 
2'
2'
Câu 2
(2điểm)
&

.#
#


.#
##
!
!
.#
)

!
.#
#

E#
##
b#
#
&

b!
!

2'
2'
2'
'
#(
.'
#


.'


)
.



.

E'


b

'
#(
b
)
2'
2'
2'
#
#*
c#
)
.#
)


.!

$%

b

.



.

E


b!



b#
#*
2'
2'
Câu 3
(1điểm)
***

.*
'
#)
.
***

"'
#)
.*".
E-8d L%-$%-'
2'
2'
2'
2'
Câu 4
(1,5điểm)
Ve4-56L%-

E-a!&⇒-aa&&⇒-a&
E-a*!⇒-aa!!⇒-a!
E-a*⇒-aa**⇒-a*
2'
2'
2'
R,8-aL%7N&2!2*$%-L%8#9**c-c

Q8J$%=>-a.')
f6 ''
2'
2'
2'
Câu 5
(3,5điểm)
8!"#.#≠#-3"-+≠3+
⇒-CDg93$%+
a3g=;hi6=>3CDg9-$%+A
+CDg9-$%3
6,#-A3A+CD8%,g9jL4
⇒-232+CDB%
2'
2'
2'
2'
2'
FG&HIC#-232+,6=:8G
J&"#.HI
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