如图,AB=AC,AD=AE,DE=BC且∠BAD=∠CAE求证四边形BCDE是矩形

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 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=AE,AC=AD,ED=BC,AE⊥AB 求证BC⊥DE 如图,在△ABC中,DE∥BC,AD/BD=AE/EC,求证:AD/AB=AE/AC 如图,AB/AD=BC/DE=AC/AE,求证：∠BAD=∠CAE 如图AB/AD=BC/DE=AC/AE,求证∠ABD=∠ACE 如图,已知AB=AC,DE‖BC,试说明:AD=AE. 如图,AB=AD,AC=AE,角BAD=角CAE,连接BC,DE,求证:BC=DE. 如图,AB=AD,AC=AE,∠BAD=∠CAE,连接BC、DE,求证：bc=de 如图,AB垂直于AC,AD垂直于AE,AB=AD,BC=DE.求证：AM=AN 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,AB=AE,AB⊥AE,AD=AC,AD⊥AC,M为BC中点,求证:DE=2AM 如图,在△ABC中,AD⊥AB,AD=AB,AE⊥AC,AE=AC,M为BC中点 求证：2AM=DE 如图,在三角形ABC中,∠ADE=∠C,则下列等式成立的是A.AD/AB=AE/AC B.AE/BC=AD/BDC.DE/BC=AE/ABD.DE/BC=AD/AB