如图所示,已知AB=CD,BE=DF,AE=CF,求证:OA=OC,OE=OF
如图所示,已知AB=CD,BE=DF,AE=CF,求证:OA=OC,OE=OF
如图,已知ABⅡCD,OA=OD,AE=DF,求证:BEⅡCF.
已知BC,EF交点O,AB//CD,OA=OD,AE=DF,求证BE//CF
如图AB=CD,BE=CF,AE=DF求证OA=OD
如图所示,已知AB平行CD,OA=OD,BC过O 点,E,F在直线AOD上且AE=DF.求证EB平行CF
如图所示,已知AB=CD,BE=DF,△ABE全等于△CDF,求证;AB平行CD,AE平行CF
已知AB=CD,BE=DF,AE=CF,问AB‖CD吗
已知:如图,AB=CD,BC=DA,AE=CF.求证:DF=DE
平行四边形的性质已知:如图,平行四边形ABCD的对角线相交于点O.求证OE=OF,AE=CF,BE=DF
已知如图,E.F在BD上,且AB=CD,BF=DE,AE=CF,求证:OA=OC.OB=OD
如图,已知AB//CD.OA=OD,点F.D.O.A.E在同一条线上,AE=DF,求证,EB//CF
如图,已知AB‖CD,BC/EF相交于点O,OA=OD,AE=DF,求证:EB‖CF