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1、1长宁区长宁区 2009 学年度第一学期期末初三数学抽测试卷学年度第一学期期末初三数学抽测试卷 (测试时间:100 分钟,满分:150 分)考生注意:考生注意: 1本试卷含三个大题,共 25 题答题时,考生务必按答题要求在答题纸规定的位置上作答,在草稿纸、 本试卷上答题一律无效 2除第一、二大题外,其余各题如无特别说明,都必须在答题纸的相应位置上写出证明或计算的主要步 骤 3本次测试可使用科学计算器一、选择题:(本大题共一、选择题:(本大题共 6 题,每题题,每题 4 分,满分分,满分 24 分)分)1在 RtABC 中,C=90,a、b、c 分别是A、B、C 的对边,下列等式中,正确的是(A
2、); (B); (C); (D)cbA sinacB cosbaA tanabB cot2如图,已知 ABCD,AD 与 BC 相交于点 O,AODO=12,那么下列式子错误的是(A)BOCO=12; (B)ABCD=12;(C)ADDO=32; (D)COBC=123对于抛物线 y=(x+2)2,下列说法正确的是(A)最低点坐标是(2,0) ; (B)最高点坐标是(2,0) ;(C)最低点坐标是(0,2) ; (D)最高点坐标是(0,2) 4已知二次函数的图像如图所示,那么 a、b 的符号bxaxy2为(A)a0,b0; (B)a0; (C)a0,bE, 当CDP 与CBE 相似时,PCD=
3、BCE(1 分),即(1 分)PCDP BCBExxy 42 2把代入,整理得14 xy42xx=2,x=-2(舍去) (1 分) y=4 AP=CP,AB=BE(1 分) BPCE,即 BPDE内部资料 仅供参考内部资料 仅供参考9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ!djs#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu#KN&MuW
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