如图12_3,AB=AD,BC=DE,角BAD=角CDE求证:1.AC=AE 2.角CAE=角CD如图12_3,AB=AD,BC=DE,角BAD=角CDE求证:1.AC=AE 2.角CAE=角CDE

如图12_3,AB=AD,BC=DE,角BAD=角CDE求证:1.AC=AE 2.角CAE=角CD如图12_3,AB=AD,BC=DE,角BAD=角CDE求证:1.AC=AE 2.角CAE=角CDE 如图,AB=AD,AC=AE,角BAD=角CAE,连接BC,DE,求证:BC=DE. 如图,DE//BC,请问AD:AC=AE:AB?AD:AE=AB:AC? 已知,如图,DE垂直AC,AD=BC,DE=BF,求证AB//DC 如图,在梯形ABCD中,BC//AD,DE//AB,DE=DC, 如图,AD=BC,AB=CD,DE=BF,试说明DF=BC. 如图,AB‖BC,AD=BC,AE=CF,试说明DE‖BF 已知,如图,AB=EF,BC=DE,AD=CF,求证：AB∥EF 如图,AB=EF,AD=CF,AB//EF,求证 BC=DE 已知:如图,AC/AD=AB/DE=BC/AE.求证AB=AE 已知,如图,AD/AC=DE/AB=AE/BC,求证AB=AE 已知,如图,AD:AC=DE:AB=AE:BC 求证：AB=AE 如图,AB=AD,AC=AE,∠BAD=∠CAE,连接BC、DE,求证：bc=de 如图,AD\BC,AD=BC,AE=CF求证(1)DE=DF,(2)AB\cd主要说明为什么DE=BF,DE就=DF. 如图,AD=BC AD//BC AE=CF,求证（1）DE=BF (2)AB//CD 如图,梯形ABCD中,AD//BC,E是AB的中点,DE⊥CE,求证：AD+BC=DC 已知,如图BF⊥AD,EC⊥AD,垂足分别是F,C,BC=EF,AB‖DE,求证BC‖EF,AB=DE 已知,如图BF⊥AD,EC⊥AD,垂足分别是F,C,BC=EF,AB‖DE,求证BC∥EF,AB=DE