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初中数学：怎么求PA+PB+PC的最小值？费马点问题，旋转60度是关键
初中数学：怎么求PA+PB+PC的最小值？费马点问题，旋转60度是关键
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆82/333
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