so crao DUC vn nAo r4o of rnr ruyfx srNH vAo r,dr to
Nim hgc 2012 - 2013
Mdn: TOAN
Kh6a ngiy ll-7-2012
.(, Thdi gian ldm bdi :120 phrrit
(Khdng t<6 tfrdi gian ph6t de)
AN GIANG
BT CniNH TIIffc
b) Giai phuong trinh bflc hw: x2 - 2^l7x * 1 = 0.
c) Gi6i hQ phucrng trinh :
{3*-7:7
lZx+!=3
Biri 2: (2,0 tti6m)
Cho him s6 y = x + L (*) c6 dO thi ld tluong thing (d)
a) Tim h€ sO g6c vd vC dO thi hem s6 (*)
b) Ttm a d6 Parabol (P): y = axz di qua di6m M(1; 2).X6cctinh tga etQ giao di6m crla
dudrng thi"e (d) va Parabol (P) vdi a viatim dugc
Bii 3: (2,0 di6m)
Chophuongtrinh 6n x :,f - 2(m + I)x * m2 * 3 = 0
a) Vdi gi6 tri ndo bria mthlphuong trinh c6 hai nghiQm phen biQt.
nghi$m
Bdri 4: (3,5 ili6m)
Cho dudrng trdn (O) bdn kinh R = 3cmvd mQt di6m I nim ngodi dudrng trdn, bi6t rang
Ol = 4cm Ttr I kd hai ti6p tuyiSn IA vi IB vdi etudrng trdn (A, B ld ti6p Ai6m1.
a) Chtmg minh tA giftc OAIB nQi tiiip
.b) Ttr I kd dudrng th&ng vu6ng g6c voi OI cat tia OA tai o' Tinh oO' vd di€n tich tam.
gi6c IOO'
c) Tir O'ke O'C r,u$ng g6c BI cit duimg th8oe BI tai C Chfmg minh reng O't ld tia
-,H6t