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九年级数学：抛物线上是否存在点P，使得面积相等？二次函数常考
九年级数学：抛物线上是否存在点P，使得面积相等？二次函数常考
七年级数学，一元一次方程应用题，各种类别的题型，这里都有详解543/581
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