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八年级数学：周长取最小值，怎么求四边形PMON的面积？有些难度
八年级数学：三角形周长取最小值，怎么求四边形PMON的面积？
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆216/333
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