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