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九年级数学：D是圆上动点，怎么求BE的最大值，与最小值的和？
九年级数学：D是圆上动点，怎么求BE的最大值，与最小值的和？
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆297/333
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