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 Bii 1: (2,5 tli6m) : a) Rft go.n A = Zffi - 6i5 + iT6. ." 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. b) Tim m d|,phucrng trinh c6 hai nghiQm th6a tich hai nghiQm kh0ng l6n hon t6ng hai 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 phen gidc ota tre. ,H6t . 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 Bii 1: (2,5 tli6m) : a). 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)