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八年级数学：等边三角形，怎么求PM+PNDE 最小值？这是一道好题
八年级数学：等边三角形，怎么求PM+PNDE 最小值？这是一道好题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆153/333
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