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九年级数学：E是正方形外动点，∠AED=45°，怎么求PE的最大值？
九年级数学：E是正方形外动点，∠AED=45°，P是AB的中点，怎么求PE的最大值？
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆225/333
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