已知：AB=CD,AE=CF,BF=DE,说明①BE=DF,②BE平行DF

AE=DF CE=BF AB=CD 问BE和CF平行吗?为什么? 如图,已知AB=CD,AD=BC,DE=BF,说明BE=DF 已知:如图,E,C是BF上两点,且BE=CF,AB=DE,AC=DF,求证:AB平行DE,AC平行DF 如图,已知AB平行DE,AB=DE,BE=CF.求证：AC平行DF 如图AB=CD AF平行DF CF平行BE 求证AF=DE 如图,已知,AD=BC,AB=DC,DE=BF说明:(1)AE‖CF,(2)BE=DF 已知AB=CD,BE=DF,AE=CF,问AB‖CD吗 如图,已知DE平行于AB,DF平行于AE,试说明CE·BE=CB·EF 如图,ad=bc,ab=cd,de=bf,说明df=be 已知,AE=DF,BF=CE,AE//df,问ab=cd吗?说明理由. 已知:如图,AD=BC,AB=CD,DE=BF求证:BE=DF 已知如图,AB+AD=BC+CD,求证BF+DF=BE+DE