Đề thi HK II Toán 7 - Bắc Ninh 2007 - 2008

s0 cn-nr eAc NINH or rru xrEnn D.rNrr cn.A.r LU0NG NAvr HQC 2007-2008 PHONG KT&KD M6n: TOAN LoP 7 :::==::: Ihgj€iaq: g0ph,frt (Kh6ngk€ thdt gian giao di) 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 A) 11; B) e; C) 10 D) 18' 2) Do thi hdm si5 y : ax eti qua di6m A(-3; 2) n6n hQ s6 a ld 2 -2 c)+; o)1. e)T; B);) -,z z' 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 trarug- . s0 cn-nr eAc NINH or rru xrEnn D.rNrr cn.A.r LU0NG NAvr HQC 20 0 7- 2008 PHONG KT&KD M6n: TOAN LoP 7 :::==::: Ihgj€iaq: g0ph,frt (Kh6ngk€ thdt gian giao di) NSdy thi: 02/05 /2008 Bii. dihm) 1) Tinh gi5 tri cira bi6u thrlc a* -xy t4i x: 3; y: -5 ; 2) Tim x bi6t: a) 2x - 9 - -3 3; Blri 3: (1,5 di€m) b) lz-zxl=t . MQt m6nh vuirn hinh cht nhgt c6 chu. 10 D) 18' 2) Do thi hdm si5 y : ax eti qua di6m A (-3 ; 2) n6n hQ s6 a ld 2 -2 c)+; o)1. e)T; B);) -, z z' 3) Tam giSc ndo ld tam giSc vudng trong cbctamgidc