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<span class='text_page_counter'>(1)</span>a. UBND HUYPN QUANG TRACH PHONG CrnO DUC - DAO TAO. DE THr CHQNHQC SrNH GrOr LOP 9 VONG I ttAtvt HQC 2013 - 2014 MOn tlti: To6n Thd'i gian:150 philt ( Kh6ng k€ thdt gian giao di). S5 nao danh:. Ciu I:. (2,0 di€m). Phdn tich cdc da thric sau thdnh nh6n ru. a). 2x2 + xy. -3y' - 6*y. b) (*' *10x)(x'z + 10x +z+)+ 128.. .. Cdu2: (2,0 diArn) a.). Gi6i phuong trinh. #.*,*ir b) Tim sd nguy6n duong x th6a m6n. 1 ].1= 2ol4t' !(,.+)f,.1)[,.+) 2[ r.3/(- 2.4)\' 3.s) [f,.-,,(**2)))2013. L(.^. Jur2. Cflu 3: (3,5 di€m) Cho tam gi6c ctAu ABC,E ld mSt dii5m thuQc cqnh. trung di6m cria doan thdng AE. Eudng th5ng di qua. AC vitkh6ng trung v6i A, K lit. E vitvu6ng. g6c v6i cludmg thtng. AB tai F cltducrng me"g di qua C vi vu6ng g6c v6i clunng th[rg BC t?tdi6m D. a) Chring minh fra gi6c BCKF li'hinh thang c6n. b) Chrmg minh KE.EC: ED.EF.. tri iliom E sao cho do4n thdng KD c6do dai nho nhat. cia 4: (1,5 di€m). Tim tet ce c6c st5 nguyCn tti p co dang: p : r{ * 1, trong do n lit c) X6c dinh vi. mQt sti nguycn ducrng, bitlt. ringp. c6 kh6ng nhi6u hcrn 19 chfi s6.. Cf,u 5: (1,0 di€m). Cho c6c s5 a, b, c ducrng th6a m5n a * b * c. a - b ' -,32' l+b2 l+c2 ' l+az ---H5t--Ghi chri: Cdn b9 coi thi kh6ng gidi thich gi th1m./.. =3. Chrmg minh rang. '..a. a.

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