2019中考数学一轮复习第一部分教材同步复习第三章函数第12讲反比例函数权威预测.doc

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1第一部分 第三章 第 12 讲1如图,反比例函数 y (k0)在第一象限的图象经过 A, C 两点,点 C 是 AB 的中点,kx若 OAB 的面积为 6,则 k 的值为_4_.2如图,一次函数 y1 kx b 的图象与反比例函数 y2 的图象交于 A(2,3), B(6, n)两mx点(1)分别求出一次函数与反比例函数的解析式;(2)求 OAB 的面积解:(1)反比例函数 y2 的图象过 A(2,3), B(6, n)两点,mx m236 n. m6, n1,反比例函数的解析式为 y2 ,点 B 的坐标为(6,1)6x把 A(2,3), B(6,1)代入 y1 kx b.得Error! 解得Error!一次函数的解析式为 y1 x4.12(2)如答图,设直线 y1 x4 与 x 轴交于点 C,则 C(8,0)12答图 S AOB S AOC S BOC 83 8112 1221248.

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