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求线段EF长度，八年级数学实验班考试压轴题，五星级难度，学霸来
如图，在△ABC中，∠BAC=90°，AB=AC，点D是AB的中点，连接CD，过B作BE⊥CD交CD的延长线于点E，连接AE，过A作AF⊥AE交CD于点F，若AE=5，求EF
人教版八年级数学，最常考易错重要知识点、竞赛、综合压轴题150/209
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