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已知:在△ABC中,∠BAC=90°,AB=AC,AE是过点A的一条直线,且BD⊥AE于D,CE⊥AE于E.(1)当直线AE处于如图①的位置时,有BD=DE+CE,请说明理由;(2)当直线AE处于如...
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教案备课库《七年级(二)期末数学测试模拟试卷2017.6.20》真题及答案
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