因为CE=BF所以CF=BE又因为AB=CD,AE=DF,所以三角形CFD全等于三角形AEB,所以叫CFD等于叫AEB,所以叫AEF等于叫EFD,所以AE平行DF
如图,AB=CD,AE=DF,CE=BF,求证AE平行DF
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