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八年级数学：当PN+PD的值取最小时，怎么求BP的长度？最短路径题
八年级数学：当PN+PD的值取最小时，怎么求BP的长度？最短路径题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆157/333
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