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如图,抛物线y=-x2+bx+c与x轴交于点A和点B(3,0),与y轴交于点C(0,3),点D是抛物线的顶点,过点D作x轴的垂线,垂足为E,连接DB. (1)求此抛物线的解析式及顶点D的坐标; ...
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教案备课库《2018年河南省中考数学一模试卷》真题及答案
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