作业帮如图,已知AB/AD=AC/AE=BC/DE,试说明:AB*EC=AC*BD
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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
如图,已知AB/AD=AC/AE=BC/DE,试说明:AB*EC=AC*BD
已知AB/AD=AC/AE=BC/DE,所以三角形ABC相似于ADE,所以角BAC=DAE,所以角BAD=CAE,又AB/AD=AC/AE,所以三角形ABC相似于ADE,所以AB/AC=BD/EC,即AB*EC=AC*BD
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,已知：AB=AE,AC=AD,AC⊥AD,AB⊥AE.求证：ED⊥BC.
如图,DE//BC,请问AD:AC=AE:AB?AD:AE=AB:AC?
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,已知AD//BC,AD=BC,AE⊥AD,AF⊥AB,AE=AD,AB=AF.求证：AC=EF.
如图,已知AB=AE,BC=ED,AC=AD,求证:BE平行CD
如图,已知AB=AC,DE‖BC,试说明:AD=AE.
如图已知AB=AC,DF⊥BC,求证AD=AE
如图,已知AE=AD,AB=AC,求证ED⊥BC
如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD‖BC,求证AC⊥EF
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
已知,如图,AB⊥AC,AB=AC,AD⊥'AE,AD=AE,求证:(1)BE=CD;(2)BC⊥CD急!帮个忙呗!
如图,已知AD/DB=AE/EC,求证 :AD/AB=AE/AC.