神马作文网已知：如图AB=DE,BC=DF,AF=CE求证：BC//DF
如图 已知AB=CD,AE=DF,CE=BF.求证：AF=DE
如图,已知AB=DC AE=DF .CE=BF 求证:AF=DE
已知如图AB=DC,AE=DF,CE=FB求证AF=DE
如图,已知AB=DC,AE=DF,CE=FB,求证AF=DE
如图,已知AB=DC,AE=DF,CE=BF,求证：AF=DE
已知:如图,AB=DC,AE=DF,CE=FB,求证:AF=DE
如图,已知DE//AC,DF//BC.求证：（1）CF/AC+EC/BC=1;（2）CF/AF•CE/BE=
如图,已知de平行于ac,df平行于bc,求证:⑴cf/ac+ec/bc=1⑵cf/af*ce/be=1
已知：如图,梯形ABCD中,AD//BC,过C作CE//AB且CE=AB,连结DE交BC于F,求证：DF=
已知,如图,AB//CD,AD//BC,点E,F分别在AD,BC上,且BE=DF.求证AF=CE
如图,ab=cd,ae=df,ce=fb,求证af=de
已知:如图,AD=BC,AB=CD,DE=BF求证:BE=DF