(贵阳专用)2019中考数学总复习第1部分教材同步复习第三章函数课时11二次函数的图象与性质权威预测.doc

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1第一部分 第三章 课时 111二次函数 y x24 x3 的图象交 x轴于 A, B两点,交 y轴于 C点,则 ABC的面积为( C )A6 B4 C3 D12将抛物线 y ax21 平移后与抛物线 y a(x1) 2重合,抛物线 y ax21 上的点A(2,3)同时平移到 A,那么点 A的坐标为( A )A(3,4) B(1,2) C(3,2) D(1,4)3若关于 x的二次函数 y ax2 bx c中,函数 y与自变量 x的部分对应值如下表:x 1 0 1 2 3 y 10 5 2 1 2 则当 y2时, x的取值范围是_ x1 或 x3_.

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