已知,如图,AB=AD,AE=AF,CB=CD,CE=CF.求证：∠DAF=∠BAE

已知;如图,AB=AD,CB垂直于AB,CD垂直于AD,E、F分别是BC、DC的中点.求证；AE=AF 已知,如图,AB=AD,CB⊥AB,CD⊥AD,E,F分别是BC,DC的中点求证AE=AF急! 已知,如图,AB=AD,AE=AF,CB=CD,CE=CF.求证：∠DAF=∠BAE 如图,已知AD//BC,AD=BC,AE⊥AD,AF⊥AB,AE=AD,AB=AF.求证：AC=EF. 如图,已知AE⊥AD,AF⊥AB,AB//CD,AE=CD,AE=AD,AF=CD,求证AC=EF 如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD‖BC,求证AC⊥EF 如图,已知AD=CB,AE=CF,DE=BF,求证AB=CD. 如图,已知AD=CB,AE=CF,DE=BF,求证：AB∥CD. 如图,已知AE⊥AD,AF⊥AB,AB∥CD,AF=CD,AE=AD,求证：AC垂直EF. 已知：如图,EF‖BC,AE²=AD·AB.求证：DF‖EC.【EF‖BC,平行线分直线,成比例AE/AB=AF/AC,AE²=AD·AB,AD/AE=AE/AB=AF/ACDF‖EC】这是解法、可是为什么AD/AE=AE/AB=AF/AC,DF就平行EC、要理由 已知：如图,EF‖BC,AE²=AD·AB.求证：DF‖EC.【EF‖BC,平行线分直线,成比例AE/AB=AF/AC,AE²=AD·AB,AD/AE=AE/AB=AF/ACDF‖EC】这是解法、可是为什么AD/AE=AE/AB=AF/AC,DF就平行EC、要理由 如图11,已知:AD=CB,AF=CE,DE=BF,试说明AB‖CD 已知,如图.AE=AF,EG平行AD,交AB于F,求证AD平分∠BAC 如图；在梯形ABCD中；AD平行CB；点E在BC上；AE=BE点F是CD的中点；AF⊥AB;若AD=2.7AF=4AB=6求CE的长 如图,AD∥BC,AD=BC,AE⊥AD,AF⊥AB,且AE=AD,AF=AB,求证：AC=EF. 如图,在平行四边形ABCD中,AF⊥CD的延长线于F,AE⊥CB的延长线于E,AB=6,AD=4,AF=3,求AE的长 如图,在平行四边形ABCD中,AF⊥CD的延长线于F,AE⊥CB的延长线于E,AB=6,AD=4,AF=3,求AE的长 如图,AB‖CD,AD‖BC,AE⊥AB,AF⊥AD,AE=AB,AF=AD,试说明AC=EF