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八年级数学：怎么求BE+DF的最小值？先旋转60°，出等边三角形
八年级数学：怎么求BE+DF的最小值？先旋转60°，出等边三角形
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆123/333
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