nt rnr rcrAo sAr crruytN prt r,AN rr TRUd}vG TIIPT T"f XOEY xAu Hec 2oro - 2o1r lvtoN roAN LOP IO-BAN KHTN Thli gian: 150 pMt (kh6trg t6 ttroi gian giao d6) Ciu I1Z Oi6m; t Giai b6t phucng o,no, €F2x+5 < I (x e.R) [z,laa2t.gy +3x=s,tto-x-+y' 2.GiaihQphuongtrinh:1.' , ; r3' ++ , -\ (x,yeR) lx"+xY'=x'Y+6Yj CAu II (2.0 tli6m) Cho phuong trinh: x2 phdn bi6t CAu III +Zmx-ilm(m+t)-Sl=0 (l) Tim lzd€ phuong trinh (llc6 nghiQm thgc 4,x, thoi mdn +2x, =3 1}.0 aieml Trong m[t phing tqa dQ Orycho MBCvhi ,l(-t;t), hai tli6m B,C thir tg nim tr€n dudng thing L,:x-y+4=0, Lr:3x-y-8=0, trung di€m Mctn c4nh ABnim tr€n cluong thang t Lr:2x+3y-4= Tim to4 ctQ c6c iti6m B,C cho MBCvudng tai l Trong mft phing tea dQ Orycho tluong tron phuong trinh dudng thing A qua M vit ti}p xric (C):(x-l)'+(7-15)'=3vd dii:n M(-l;3) Lgp vdi (C) Cfiu IV (2.0 di6m) l Cho MBCthatmin mo=g ghfng minh ring sinl = Zsin(A+2c) Cho cdc s6 a,pthda mdn h€ *.i [r'"1, oreu Kten' +2otor)=1,o.(-*,*) l"or1r* z',n) =|, Tinh sin (a +2P) o.("r+) Cflu V (1.0 tli€m) Cho s6 thgc duong x,y,zthbamdn di€u ki€n D - - x' 'i- r+y * z =3 Tim gi6 tr!nh6 nh6t cria bi6u thric: v' ! -L- z' r i x+Zya'y+Zza'z+2xa **:-Het-'- H9 vi t6n thi sinh: Cdn bQ coi thi khdng giii thich gi th0m , S0 b6o danh: