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八年级：动点P在BC上，当OP+PD最小值时，求P点的坐标？将军饮马
八年级：动点P在BC上，当OP+PD最小值时，求P点的坐标？将军饮马问题求最小值。
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆163/333
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