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九年级数学：怎么求PD+PH的最小值？二次函数综合，将军饮马问题
九年级数学：怎么求PD+PH的最小值？二次函数综合，将军饮马问题
九年级数学，二次函数专题，中考压轴题每天一练，培优专题220/287
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