如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证①EC=BF②EC⊥BF.

如图所示,已知ae⊥ab,af⊥ac,ae=ab,af=ac.求证ec⊥bf 如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证：（1）EC=BF；（2）EC⊥BF. 如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证①EC=BF②EC⊥BF. 如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证：（1）EC=BF；（2）EC⊥BF 如图所示,已知AB=AC,AE=AF,AE⊥Ec,AF⊥BF,垂足点为E、F求证：∠1=∠2 如图所示,已知AE⊥AB,AF⊥AC,AF=AC,求证：（1）EC=BF（2）EC⊥BF 如图所示,已知AE垂直AB,AF垂直AC,AE=AB,AF=AC,求证.EC垂直BF 如图所示,已知三角形ABC中,AB=AC,F在AC上,在BA的延长线上取AE=AF,求证：EF⊥BC. 如图,已知AE⊥AD,AF⊥AB,AB//CD,AE=CD,AE=AD,AF=CD,求证AC=EF 已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.试证明:(1)EC=BF;(2)EC⊥BF 已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.试证明:(1)EC=BF;(2)EC⊥BF 已知AE⊥AB,AF⊥AC,AE＝AB,AF＝AC.求证EC＝BF,EC⊥BF快 如图8,已知:AE⊥AB,AF⊥AC,AE=AB,AF=AC.试证明:(1)CE=BF;(2)CE⊥BF 已知AD是△ABC的中线AE⊥AB,AF⊥AC且AE=AB,AF=AC连接EF求证AD=1/2EF 已知AD是△ABC的中线AE⊥AB,AF⊥AC且AE=AB,AF=AC连接EF求证AD=1/2EF 如图所示,已知AB⊥AC,AD⊥AE,AB=AC,AD=AE,求证：BE=DC 如图所示,已知AB⊥AC,AD⊥AE,AB=AC,AD=AE,求证：BE=DC非常急 如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD‖BC,求证AC⊥EF