2018_2019学年九年级数学上册第二十二章二次函数小专题6直线与抛物线的交点问题习题(新版)新人教版.doc

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1小专题 6 直线与抛物线的交点问题【例】 如图,已知直线 y2x2 与 x 轴,y 轴分别相交于点 M,N,抛物线 yx 2x6与 x 轴相交于点 A,B,与 y 轴相交于点 C,且直线与抛物线的交点分别为点 E,F.(1)求点 M,N,A,B,C 的坐标;(2)求点 E,F 的坐标;(3)根据图象写出使一次函数值大于二次函数值的 x 的取值范围【解答】 (1)对于 y2x2,当 x0 时,y2;令 y0,即 2x20,解得 x1,点 M,N 的坐标分别为(1,0)和(0,2)对于 yx 2x6,当 x0 时,y6;令 y0,即 x2x60,解得 x12,x 23,点 A,B,C 的坐标分别为(2,0),(3,0),(0,6)(2)联立 解得 或y 2x 2,y x2 x 6, ) x1 4,y1 6, ) x2 1,y2 4.)点 E,F 的坐标分别为(1,4)和(4,6)(3)由图象可知,当11 时,一次函数值大于二次函数值

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