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初中数学：P是AC边一动点，怎么求1/2PA+PB的最小值？经典考题
初中数学：P是AC边一动点，怎么求1/2PA+PB的最小值？经典考题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆112/333
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