如图,AB=AC,AD=DE=EC=BC,则角ABC的度数为

如图,AB=BC=AC,CD=DE=EC.求证：AD=BE 如图,ab=ac=bc,cd=de=ec求证ad=be 如图,△ABC中,DE//BC,AD/BD=AE/EC,求证EC/AC=BD/AB 如图,已知AB/AD=AC/AE=BC/DE,试说明:AB*EC=AC*BD 如图,已知AB/AD=AC/AE=BC/DE,试说明:AB*EC=AC*BD 已知:如图,AB/AD=AC/AE=BC/DE,求证,AB乘EC=AC乘BD 如图,在△ABC中,DE∥BC,AD/BD=AE/EC,求证:AD/AB=AE/AC 如图,AB=AC,AD=DE=EC=BC,则角ABC的度数为 如图 ab⊥bc dc⊥bc,ab=ec,ac=de.求证ac⊥de 如图,AC⊥BD AC=DC,BC=EC求证DE⊥AB 已知,如图,AD/DB=AE/EC,证明DE/BC=AE/AC 已知:如图,AD/AB=AE/BC求证：AD/AE=DB/EC和AB/DB=AC/EC 已知:如图,AD/AB=AE/BC求证：AD/AE=DB/EC和AB/DB=AC/EC 如图,若AB=DE,则下列结论正确的是( ) A.AD=EB B.AC=EC C.BC=DC D.AB=BC 如图,DE//BC,请问AD:AC=AE:AB?AD:AE=AB:AC? 如图,AB=AC,DE//BC试说明DB=EC 如图,在△ABC中,AB=AC,DE//BC.求证:DB=EC. 如图,在△ABC中,AB=AC,DE∥BC.求证：DB=EC.