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九年级数学：PQ是圆的一条切线，怎么求PQ的最小值？巧用勾股定理
九年级数学：PQ是圆的一条切线，怎么求PQ的最小值？巧用勾股定理
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆114/333
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