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九年级数学：P是圆上一个动点，怎么求1/2PA+PB的最小值？阿氏圆
九年级数学：P是圆上一个动点，怎么求1/2PA+PB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16/333
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