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九年级数学：P是DE弧上的动点，怎么求PA+1/2PB的最小值？阿氏圆
九年级数学：P是DE弧上的动点，怎么求PA+1/2PB的最小值？阿氏圆
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆289/333
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