MNH<br />
<br />
UBND rhur sAc<br />
SO GIAO_DU9 r4 DAO<br />
<br />
TAo<br />
<br />
oi rrirra rRA uoc ri<br />
<br />
z<br />
<br />
Nem hoc: 2009 -2010<br />
MOn: Todn lotp 9<br />
Thdi gian: 90 phft (L*r1ng kd thdi gian giao dd)<br />
Nghy thi: 05 th6ng 5 n6m 2010<br />
<br />
I<br />
<br />
(<br />
<br />
I<br />
Bei<br />
<br />
I<br />
<br />
Q,5<br />
<br />
1) Giei<br />
<br />
did@<br />
<br />
(<br />
<br />
I<br />
<br />
\.<br />
<br />
c6c plucmg trinh sau:<br />
<br />
a) x2 -2x<br />
<br />
b)2x2-7x+6=0.<br />
<br />
-0;<br />
<br />
z)rinh €(.6 -r)* zJi-s.<br />
<br />
,=fJ;-+il<br />
,(+-sll<br />
Vx +1/ (r/x +1 1-*<br />
\<br />
<br />
)<br />
<br />
v6ix>o;x *t;4<br />
<br />
Bni 3 Q didd Tim m6t sd tu nhi6n c6 hai chf s6, bidt rang tdng c6c cht s6 cira n6 bang<br />
vh ndu vidt sd dy theo thrl tu nguo. c rai thi s6 6y gif,m di 36 don vi.<br />
<br />
10<br />
<br />
Bni 4 6 didd Tt didm M & ngoii duong trbn (O; 3cm) vd cdcri€p ruyen MA, MB vd (O)<br />
(A, B li cdc ticp didm). VE duong kinh AC, tidp tuydn tai C ctra ducrng rrdn (O) c6t AB & D.<br />
MO cat AB tai I.<br />
<br />
1) chrmg minh ttr gidc MAOB, OIDC nOi ridp<br />
<br />
duo.c<br />
<br />
dulng rrbn;<br />
<br />
2) T(nh AB.AD;<br />
3)<br />
<br />
Chung minh OD vuOng g6c v6i MC.<br />
<br />
Bni 5 Q,5 did@ Ctro b vi c li hai sdkh6c 0 tho6 mf,n<br />
l*1=1.<br />
<br />
bcZ<br />
<br />
cn*g<br />
<br />
minh rang it nhdt<br />
<br />
mOt trong hai phuong rrinh sau phAi c6 nghiOm:<br />
<br />
x2+bx*c=0<br />
x2+cx+b=0<br />
<br />
(1)<br />
(Z)<br />
<br />
----- De' gdm<br />
<br />
Hq vd t2n th{ sinh:<br />
<br />
0l<br />
<br />
trang<br />
SBD:<br />
<br />
I<br />
<br />