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初中数学：怎么求PC+PD的最小值？将军饮马问题，黑龙江龙东中考
初中数学：怎么求PC+PD的最小值？将军饮马问题，黑龙江龙东中考
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆14/333
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