PHoNG GrAo
DUC
va
oAo rno
olEN
csAu
oE xrBivr rRA
rrEN rHUc
rRudc rY
rHr vAo
r0p
t0 THpr
NAnn Hec zots-20r6
MOn thi:
TOAN
Thdi
gian
ldm bdi
120
phrit
CAu 1(3,0 didm).
Cho bidu thftc
.q
a)
Tim didu
kiOn cl&ra xdd, ,qc6
b)
Tinh
giStrt
cria
bidu thtc,q

-6
b) Tim
m
dd phuong
trinh c6
hai nghiOm phAn
biOt
th6a
m5n:
lx,-xrl=2
CAu
3
(1,5
didm)
Hoc
sinh
lcrp
9B
cfia
mot trudng
THCS
quy0n
g6p
trng
h6
hoc sinh
nghbo
huyOn
Tuong
Duong.

9B
c6
bao nhiOu
hoc
sinh vd sd
quydn
v&
du dinh
quyOn
g6p
ld
bao
nhiOu?
Qi^
!!3,5
didm)
cho
tam
gi6c
vudng
cAB
nQi tidp duong
trdn
tdm
o(a=
900;cB<cA).Tia
phAn gi6c
c:iua
g6c
C c6t dudng

cD
tai N,
AN c6t
duong trdn
(o)
r4i
F
.
chfng
mi4h
3
didm
o,c, F thing
hdng;
d) Goi
I
td
giao
didm cria
BD vI
MN. Ctrung
minh
AI
h tidp tuydn
cira
duong
trbn tAm
O.
Qu
5(0,5

cnAu
oi
rrdrvr
rnn xrfN
THUc
rRuoc xi rHl
vAo
lop
l0 THPT
MOn
thi: TOAN
CAU
Ndi
dung
Diim
Ia
Didu
kiOn:
x>
0;x
+
4;
0,5
1,0
0,5
0,5
0,5
/l-
n-
J*,;J;

^lx
-2
fJi-r'o [Ji-r'o
<>i-
;l
lJx-2<0
lJr'-2>0
timduoc:
7<x<4
2.a
rm=-6,
phuong trinh
tr&thdnh
:
x2
-x-6=0;
0,25
0,25
+ Tinh duoc
L=25
+Tim
duoc:
xt:3,x2
=
-2
0,5
0,25
0,25
2.b
Dd

* xr)t'4x,xr:l-4nt
=lt,
-
,.1=,ltJm=2,
tim
duoc
m:-0,75
3.
+ tr9i;-18
so
hoc
sinh
cria
l6p 98,
y
ld
so
quydn
v& du
dinh
quy0n
g6p(
x;y ld'
c6c sd nguy€n
duong)
+ Ndu
m6i
em
g6p
3

lv=90
0,5
4.
a)
Vi
CD
la tia
phAn
gi6c
ciatr-a
=
6)=68=7jD:EID
,':
"
-"
" '- ''-"j'1
"'-'-"'
b)
ABCD_
dQ-qe
da+g
y6l LEpD
(g,g)
DB
DD
-
'L
e
DBz
=

DA
=
DM,
6)=58
=DA
=
DB,=DB
=
DM
=
L,DBM
cdn
-
6rfu *
rEfu
=
eoo
=
BMD
* 6it
=
6it
* i6it
=
6tfu
=
6it
=
LMDI
can(dinh

0,5
0,5
0.5
. _- r
|
4
Ta
c6
x;y
ld,hai
sd
duong
thi
:
'
>
L
t
x
y
x+y
1
1
4
2.
I
1
-
4
2

"="
xdYrakhi
a=b c'
1
*.
Chrt
y:
-
Hoc
sinlt
gidi cdch
khdc
dfing
cho
didm
t,i
da
-
-
HQc
shhLhAng
vd
hinh
kh1rtg
chd'm
didm
cdu
4'