Tinh di6n tich ctra m6nh vucm d6.. Chrmg minh EH : DK.
Trang 1s0 cn-nr eAc NINH or rru xrEnn D.rNrr cn.A.r LU0NG NAvr HQC 2007-2008
NSdy thi: 02/05/2008
Bii 1: (2 dihd Chsn c6u tr6lli itirng:
1) Eon th.uc 2x6 y3 z c6b0c dOi vtri tflp hgrp c5c bi6n ln
2) Do thi hdm si5 y : ax eti qua di6m A(-3; 2) n6n hQ s6 a ld
3) Tam giSc ndo ld tam giSc vudng trong cbctamgidc c6 d0 dAi ba canh
A) 10; 15; t2; B) s; 13; 12; C) 7;7; L0; D) 3; a;6'
4) AABC cdn O A c6 gdcB: 400 Khi d6 s5 do crta gdc Alir
A) 1o0o; B) 800; ) 90oi D) 700'
BAi 2: G dihm)
1) Tinh gi5 tri cira bi6u thrlc a* -xy t4i x: 3; y: -5;
2) Tim x bi6t: a) 2x - 9 - -33;
Blri 3: (1,5 di€m)
b) lz-zxl=t .
MQt m6nh vuirn hinh cht nhgt c6 chu vi b6ng 100m vi ti s6 gita hai eanh cta n6
le 1 Tinh di6n tich ctra m6nh vucm d6
7
Biri 4: (j,5 diilm)
Cho AABC cdn 6 A G.ego).Tt B vi C theo thri tr; k6 BDIAC (DeAC),
CE J AB (E e AB) Gqi O ld giao di6m cria BD vi CE'
1) Chrmg minh MBD = MCE; .
2) Chrmg minh AOBC cdn;
3) K6 EH la tia phfln gi6c clua goc BEO (He BO), DK le tia ph0n gi6c cira
g6c CDO (Ke CO) Chrmg minh EH : DK.
a) Gqi I td giao di6m EH vi DK chrmg minh ba di6rn A, o, I th6ng
hing.-Ei sfim Al