如图· ab/ad=ac/ae=bc/de=6/5,且△abc的周长与△ade的周长相差为4,求△abc与△ade的周长

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,A,B,C三点在⊙O上,且AB=AC,弦AE交BC于D,求证：AB²=AD·AE. 如图,已知：AB=AE,AC=AD,AC⊥AD,AB⊥AE.求证：ED⊥BC. 如图,AB=AC,EB=EC,AE的延长线交BC于点D.求证：AD⊥BC 如图 在三角形ABC中 AD垂直BC于D AB平方=BE*BC EF垂直AB于F 求证 AD*AE=AC*EF 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AB=AE,AC=AD,ED=BC,AE⊥AB 求证BC⊥DE 如图,点D、E在BC上,且BD=CE,AD=AE,求证：AB=AC.急用. 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. 如图,圆内接△ABC中,AB=AC,弦AE与BC相交于点D.（1）求证：AE^2=AD*AC.图在这 如图,等腰三角形ABC内接于圆O,AB=AC,弦AE交BC于D,求证：AC的平方=AD*AE 如图,B,D分别在AC,CE上,AD是∠CAE的平分线,BD‖AE,AB=BC.求证:AC=AE 已知:如图,B、D分别在AC、CE上,AD是∠CAD的平分线,BD‖AE,AB=BC.请证:AC=AE