已知∠BAC=∠DAE ∠ABD=∠ACE BD=CE 说明AB=AC AD=AE

问题补充：

已知∠BAC=∠DAE,∠ABD=∠ACE,BD=CE,说明AB=AC,AD=AE,

答案：

因为∠BAC=∠DAE,所以∠BAD=∠CAE,又∠ABD=∠ACE,BD=CE,由AAS判断△ABD全等于△ACE,所以AB=AC,AD=AE