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九年级数学：怎么求BCP面积最大值？二次函数动点，铅垂定理运用
九年级数学：怎么求△BCP面积最大值？二次函数动点，铅垂定理运用
九年级数学，二次函数专题，中考压轴题每天一练，培优专题156/287
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