3、如图333,AB=AC,AE=AD,点D、E分别在AB,AC上,求证：∠B=∠C（用几何语言解此题,可简洁）

如图,DE//BC,请问AD:AC=AE:AB?AD:AE=AB:AC? 如图,AB=AD,AC=AE, 如图,AD⊥AE,AB垂直AC,AD=AE,AB=AC,AD⊥AE ,AB=AC,求证：三角形ABD≌三角形ACE 如图,已知AD/DB=AE/EC,求证 :AD/AB=AE/AC. 如图,AB⊥AC,AD⊥AE,AB=AC,AD=AE.求证BE⊥CD 如图,AB⊥AC,AD⊥AE,AB=AC,AD=AE.求证BE⊥CD 如图AB⊥AC,AD⊥AE,AB=AC,AD=AE.求证:△DAC≌三角形EAB 如图,已知：AB=AE,AC=AD,AC⊥AD,AB⊥AE.求证：ED⊥BC. 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:bd=ae:ce,求证ab:ac=ad:ae 如图 已知AD/DB=AE/EC=3/2,求AB/DB,EC/AC,AB/AD 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,AD/DB=AE/EC=2/3,求AB/DB、AE/AC的值. 如图,已知AD/DB=AE/EC=2/3,求AD/AB和EC/AC对不起 已知如图AB=AC,求证AB²=AD×AE