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时间:2017-12-06
《2018 年全国各地中考数学模拟题分类38_位似(含答案)》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、http://www.czsx.com.cn位似ABC-3-2-10123456x4321-1-2-3-4-5y1、(2011淮北市第二次月考五校联考)如图△ABC三个顶点的坐标分别为A(2,2)B(4,0)C(6,4),以原点为中心,将△ABC缩小,位似比为1:2,则线段AC的中点P变换后对应点的坐标()A、(4,3)B、(-6,-8)C、(-8,-6)D、(-2,)答案D第2题图2.(2011浙江慈吉模拟)在平面直角坐标系中有两点,,以点为位似中心,位似比为1∶3.把线段缩小成,则过点对应点的反比例函数的解析式为________________
2、__.答案:3、(2011浙江杭州模拟15)如图,在边长均为1的小正方形网格纸中,△的顶点、、均在格点上,且是直角坐标系的原点,点在轴上.(1)将△放大,使得放大后的△与△对应线段的比为2∶1,画出△.(所画△与△-3-http://www.czsx.com.cn在原点两侧).(2)求出线段所在直线的函数关系式.答案:解:(1)图略(2分)(2)由题意得:(4,0),(2,-4)(2分)设线段所在直线的函数关系式为则解得∴函数关系式为(2分)内部资料仅供参考9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#
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