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八年级数学：怎么求PB+1/2PA的最小值？胡不归问题，经典常考题
八年级数学：怎么求PB+1/2PA的最小值？胡不归问题，经典常考题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆71/333
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