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九年级数学：怎么判断方程ax²-2x+b=0根的情况？反比例函数综合
九年级数学：怎么判断方程ax²-2x+b=0根的情况？反比例函数综合
九年级数学，二次函数专题，中考压轴题每天一练，培优专题81/287
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