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八年级数学：线段EF在正方形BC上移动，怎么求OE+EF+DF的最小值？
八年级数学：线段EF在正方形BC上移动，怎么求OE+EF+DF的最小值？
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆2/333
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