如图,DE//BC,请问AD:AC=AE:AB?AD:AE=AB:AC?

已知:如图,AC/AD=AB/DE=BC/AE.求证AB=AE 如图,AB/AD=BC/DE=AC/AE,求证：∠BAD=∠CAE 如图，AB=AD，BC=DE，且BA⊥AC，DA⊥AE， 如图,AB=AC,AD=AE,请说明DE//BC的理由. 如图,已知AB=AC,DE‖BC,试说明:AD=AE. 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 已知AB/AD=AC/AE=BC/DE.试说明AD*CE=BD*AE 已知AB/AD=AC/AE=BC/DE,试说明AB*CE=AC*BD 已知:如图,AD/AB=AE/BC求证：AD/AE=DB/EC和AB/DB=AC/EC 如图,已知AD//BC,AD=BC,AE⊥AD,AF⊥AB,AE=AD,AB=AF.求证：AC=EF. 如图,AD∥BC,AD=BC,AE⊥AD,AF⊥AB,且AE=AD,AF=AB,求证：AC=EF.