PHONG GIAO DUC & DAO TAO DIEN CFIAU on xnAo sAr cnAr lUoNc vAN HoA Lop q crUa rt rr NAvr Hgc 2ot4 - zors M6n Todn - (Thd'i gian ldm bdi 90 philt) Bni 1. (2,0 diem) Cho bi6u thirc: P : ( - j; I' j- ( r-+J Jx+2 \ m\ r. I i '^ . 1. 1 a) Tim di6u kiQn x6c dfnh vd rut ggn bi6u thric P; b) Tim tdt ch cdc gi|tri cua x d6 r t o. Bii 2. (2,0 di€m) 1. Giai h6 phucrng trinh: {2x+ tt=3 l'-Y=6 2. Cho phucrng trinh bpc hai: x'- (m + l)x * m:0 (1) a) Gi6i phucng trinh (1) khi m : 3. b) Chfng.minh rdng phuong trinh (l) 1u6n c6 nghiQm v6i moi m. Bii 3. (2,0 di€m) IvI6t ca n6 chpy xu6i ddng tii A c16n e r6i chay ngugc ddng tir B t16n e fr6t t6t ch 4 gid. Tinh v4n t5c cua ca n6 khi nu6c y6n l{ng, bitit ring queng sdng AB ddi 30 km vd v6n t6c ddng nu6c le 4 km/h. Bni 4. (3,5 di€m) Cho duong trdn (O) clucrng kinh AB. Ggi D ld mQt cti6m U6t ti tr6n duong trdn (D kh6ng trirng v6i A vd B). Qua A vd D k6 hai tii5p tuy6n v6i ducrng trdn (A vd D , ,.1 i ld c6c tiOp cli6m), hai ti€p tuyOn niry cdt nhau nhau tpi E. Gqi H ld giao di€m cria AD vd OE, K li giao ili6m cta BE vdi duong trdn (O). 1. Chrmg minh tu g1itc AODE nQi ti6p 2. Chimgminh: EK . EB : EH . EO. 3. Chimg minh ttt gi6c BOHK nQi ti6p Bdi 5. (0,5 di€m) Gi6i phucrng trinh: 3i +2x=2^li +.x+1+1-x HCt . vAN HoA Lop q crUa rt rr NAvr Hgc 2ot4 - zors M6n Todn - (Thd'i gian ldm bdi 90 philt) Bni 1. (2,0 diem) Cho bi6u thirc: P : ( - j; I' j- ( r-+J Jx+2 m r.