... t II lm vt mc 10% so vi thỏng th nht nờn t II lm c 110% (900-x)=1, 1(900-x) (chi tit mỏy) Thỏng th hai c hai t lm c 101 0 chi tit mỏy nờn ta cú phng trỡnh: 1,15 x + 1,1 (900-x) = 101 0 1,15.x + 1,1.900 ... ) ( chng minh trờn) (g-g) *********************** K THI TUYN SINH VO LP 10 THPT QUNG NGI 2008-2009 Mụn thi: Toỏn Thi gian: 120 phỳt Ngy thi: 24/06/2008 Bi ( im ) Cho biu thc a/ xỏc nh a; b ... **************************************** K THI TUYN SINH VO 10 THPT NAM NH 2008 2009 Ngy thi : 26/6/ 2008 CHNH THC - MễN TON - CHUNG ( Thi gian lm bi: 120phỳt, khụng k thi gian giao ) Bi 1( 2,0 im) Cỏc...