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九年级数学：怎么求2PD+PC的最小值？找出P点轨迹，原来是阿氏圆
九年级数学：怎么求2PD+PC的最小值？找出P点轨迹，原来是阿氏圆
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆26/333
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