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九年级数学：怎么求DF+1/2AF的最小值？找到D点轨迹，胡不归问题
九年级数学：怎么求DF+1/2AF的最小值？找到D点轨迹，胡不归问题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆54/333
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