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八年级数学：怎么求PC+PQ的最小值？做对称，但怎么描述辅助线？
八年级数学：怎么求PC+PQ的最小值？做对称，但怎么描述辅助线？
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆199/333
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