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八年级数学：怎么求 BD的最小值？直角三角形，和三角形中位线
八年级数学：怎么求 BD的最小值？直角三角形，和三角形中位线
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆115/333
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