如图,已知AD/DB=AE/EC,求证 :AD/AB=AE/AC.

如图,已知AD/DB=AE/EC,求证 :AD/AB=AE/AC. 已知:如图,AD/AB=AE/BC求证：AD/AE=DB/EC和AB/DB=AC/EC 如图 已知AD/DB=AE/EC=3/2,求AB/DB,EC/AC,AB/AD 如图,在三角形ABC中,AB：DB=AC：EC,求证AD：AB=AE：AC,AD：DB=AE：EC 如图,已知AD/AE=DB/EC,AD=15,AB=35,AC=30,求AE 在三角形ABC中,AB：DB=AC：EC 求证AD：AB=AE：AB AD：DB=AE：EC 如图,已知AD/DB=AE/EC=2/3,求AD/AB和EC/AC 如图,已知AB=AC,AD=AE,求证：BD=EC. 如图,AD/DB=AE/EC=2/3,求AB/DB、AE/AC的值. 如图,已知AB=AC,DB=DC,AD的延长线交BC于E.求证：（1）BE=EC;(2)AE垂直BC. 已知:如图,AB/AD=AC/AE=BC/DE,求证,AB乘EC=AC乘BD 已知:如图.AB=AC,AE=AD,BD=EC,求证:∠BAE=∠DAC