!"#
$%& '(& )
%*+,-+
Đ thi c 01 trang
./
−=A
!"#"$%&'()$*&$$$"+,$
"'$"-."/0&1
./&
23.4!$
56
=+− xx
237.4!$
=+
=+
5
yx
yx
./'
89&:"
−
−
−
+
+
+=
a
aa
a
aa
B
*;
< ≠≥ aa
=.4!$>
??>?
@
$.4!$"-7'7!-"-A70B<
./)5
=.!C'D.EF@8G29H!&DEI&HJK'(
LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ
=::#"FHQ=AR
=:EQGE=@8
"
S="P(!T"&NLF":!0'.!CP
R#"=LQ&&A".U"VWG
./0
=>(%VX"K.4
$#!WNY"Z&:"
xyyyxx
yx
P
+++
+
=
BBBBBBBBBBBBBBBBBBBBBBBBBBB)RBBBBBBBBBBBBBBBBBBBBBB
12
./
−=A
!"#"$%&'()$[&$$$"+,$
"'$"-."/0&1
E@\B6@
)$"-."/0&)$*&$"+,$"'G
./&
23.4!$
56
=+− xx
237.4!$
=+
=+
5
yx
yx
"-
∆
@]@^_
`.4!$"-7'7
>
@
=
−
^6
<
>
@
=
+
^6
5<
[,(.4!$"-7>
@
<
>
@5<
"-
=+
=+
5
yx
yx
⇔
=+
=
yx
y
⇔
=+
=
x
y
⇔
=
=
y
x
[,(7.4!$"-7
=
=
y
x
<
./'
89&:"
−
−
−
+
+
+=
a
aa
a
aa
B
*;
< ≠≥ aa
=.4!$>
??>?
@
$.4!$"-7'7!-"-A70B<
"-
−
−
−
+
+
+=
a
aa
a
aa
B
−
−
−
+
+
+=
a
aa
a
aa
B
( )( )
aaB −+=
aB
−=
a.4!$"-7'7$
∆
b_
"-
∆
b@?
]
@
??]
@?
∆
b_
⇔
?_
⇔
_B
c
[$.4!$"-7BT(>@B*.d"
B
??B?
@
⇔
]]?
@
⇔
]?
@
⇔
B@
⇔
@e"@cc
fc*cc%&(!@<@NgG
./)5
=.!C'D.EF@8G29H!&DEI&HJK'(
LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ
=::#"FHQ=AR
=:EQGE=@8
"
S="P(!T"&NLF":!0'.!CP
R#"=LQ&&A".U"VWG
"-
∠
E=F@
-"AR"Oh.!C
(
∠
Q=F@
<
iP"-
∠
QHF@
:#"FHQ="-
∠
Q=F?
∠
QHF@
?
@\
G
⇒
:#"FHQ=:#"ARG
QjY(
∆
EHQkKP*;
∆
E=FGT
⇒
AB
AD
AC
AI
=
⇒
EQGE=@EHGEF
⇒
EQGE=@
R
G8@8
<
" QjY(
∆
ELQkKP*;
∆
E=LG
DH
M
M
H
E
O
B
C
⇒
AM
AD
AC
AM
=
⇒
EL
@E=GEQ
⇒
ELR&(R.!CPR
#"=LQEL*&-"*;LF%&(!'.!CP
R#"=LQ&&A".UFL"VWG
./0
=>(%VX"K.4
$#!WNY"Z&:"
xyyyxx
yx
P
+++
+
=
[$>(_T#KlFYU:"=m"%VK.4
ba
ab
+
≤
"-
^
5
5
yxyxx
yxx
+
=
++
≤+
^
5
5
xyxyy
xyy
+
=
++
≤+
f*"-
5
5
5
55
5
=
+
+
≥
+++
+
=
yx
yx
xyyyxx
yx
P
Q-2MM
yx
xyy
yxx
P =⇔
+=
+=
⇔=
5
5
5
5
<
Giáo viên: Phan Duy Thanh – THCS Dị Nậu – Tam Nông – Phú Thọ