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八年级数学：P是动点，怎么求PD+PE的最小值？菱形中将军饮马问题
八年级数学：P是动点，怎么求PD+PE的最小值？菱形中将军饮马问题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆39/333
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