【導讀】3.(5分)如圖,已知∠BAC=∠DAE,∠ABD=∠ACE,BD=CE,BD=CE,∴△BAD≌△CAE,6.(4分)如圖所示,在∠AOB的兩邊上截取AO=BO,OC=OD,①△APC≌△BPD;②△ADO≌△BCO;③△AOP≌△BOP;④△OCP≌△ODP.7.(4分)如圖,AB=DB,∠1=∠2,請你添加一個適當?shù)臈l件,8.(4分)在△ABC和△DEF中,AB=A′B′,∵AD⊥BC,A′D′⊥B′C′,∴∠BDA=∠B′D′A′=90°,線于點F,若EF=5cm,則AE=____cm.論:①∠1=∠2;②BE=CF;③△ACN≌△ABM;④CD=DN.BC于點F,且AO=CO,∠ABC=∠CDA,請問BE與DF相等嗎?OB=OD,再用“AAS”證△BOE≌△DOF,∠C+∠EOC,即∠ADO=∠AEO,∠1=∠2,AO=AO,命題1的證明:∵AE∥DF,∴∠A=∠D,∵AB=CD,∴AB+BC=CD+BC,即AC=△AEC和△DFB中,△DFB中,∵∠A=∠D,∠E=∠F,CE=BF,