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九年级数学：D是圆上一动点，怎么求2AD+3BD的最小值？阿氏圆问题
九年级数学：D是圆上一动点，怎么求2AD+3BD的最小值？阿氏圆问题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆288/333
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