PHoNG GrAo DUC vA EAo rAo nmN cuAu or rnr voNG r, cHgN Hec srNH cr6t nuvpN Lop s NAM HQC 20r4-20rs Mdn Tofn - (Thli gian ldm bdi 150 phrit) lf CAu 1. (6 diom) 1. Tinh gi6 tri cria bitiu thr?c: A: J4iJj *rfi -+{z . { 2. Cho bi6u thric: p : 2* *J - I U x-2 x'-5x-t6 x-3 a) Tim ttiOu kiQn cta x ee p cO nghia vd rut ggn biO p. b) Tim tht ch circ gi|tri cria x rt6 p nguyOn. q+,t ;;,'::':7' 7=!>z 'I 2. Tim nghiQm nguy6n tO cria phuong trinh: x, - 2y, : 1 1)t '0 Cfiu 3. (a dicm) 4 'tl '4 - -af-etu-f. {fiJi etTr) - - 1. Cho hinh vu6ng ABCD c6 cAnh bang a. LAy di0m M toy y trOn ducrng ch6o AC, ke ME I AB, MF l- BC. X6c tl1nh vi tri cria M tr0n ducrng ch6o AC AC Oi-en ticfr ADEF nh6 nh6t, tim gi6 tr! 116. Chung Tinh ring: AB.AE-+ AD.AF : AC' Q cau s. (2 dicm) Cho ba sd a, b, c th6a m[n a + b + c :0 vd m6i sO eO 16n hcyn - 1 vd nh6 hcrn 1. Chringminhrdng: a2 +b' + c' <2. lt d," +/ n rl) ' oL ^rrr/'1*cst td/'c MW ftln'furta <2 ) f ^'+ '(''. C7 6. \* a "/'ur t ( . 20r4-20rs Mdn Tofn - (Thli gian ldm bdi 150 phrit) lf CAu 1. (6 diom) 1. Tinh gi6 tri cria bitiu thr?c: A: J4iJj *rfi -+{z . { 2. Cho bi6u thric: p : 2* *J - I U x-2 x'-5x-t6. x-3 a) Tim ttiOu kiQn cta x ee p cO nghia vd rut ggn biO p. b) Tim tht ch circ gi|tri cria x rt6 p nguyOn. q+,t ;;,'::':7' 7=!>z &apos ;I 2. Tim nghiQm nguy6n. ME I AB, MF l- BC. X6c tl1nh vi tri cria M tr0n ducrng ch6o AC AC Oi-en ticfr ADEF nh6 nh6t, tim gi6 tr! 116. Chung Tinh ring: AB.AE-+ AD.AF : AC' Q cau s. (2 dicm) Cho