已知BC,EF交点O,AB//CD,OA=OD,AE=DF,求证BE//CF

已知BC,EF交点O,AB//CD,OA=OD,AE=DF,求证BE//CF 如图,已知AB‖CD,BC/EF相交于点O,OA=OD,AE=DF,求证:EB‖CF 如图,已知ABⅡCD,OA=OD,AE=DF,求证：BEⅡCF. 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,AB=CD,AE⊥BC于E,DF⊥BC于F,AD交EF于O,OA=OD,求证：BF=CE 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⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF. 如图所示,已知AB=CD,BE=DF,AE=CF,求证:OA=OC,OE=OF 如图，AB∥CD，OA=OD，点F、D、O、A、E在同一直线上，AE=DF，求证：EB∥CF． AB∥CD,OA=OD,点F,D,O,A,E在同一条直线上,AE=DF.求证：EB∥CF 如图,已知AB‖CD,OA=OD,AE=DF,求证①△ABE≡△DCF②EB‖CF