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八年级数学：菱形中，怎么求PB+PC的最小值？将军饮马问题变式题
八年级数学：菱形中，怎么求PB+PC的最小值？将军饮马问题变式题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆32/333
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