∵∠DAB=∠EAC,∴∠DAB+∠BAE=∠EAC+∠BAE,即∠BAC=∠DAE,
在ΔABC与ΔADE中:
∠B=∠D,
∠BAC=∠DAE,
BC=DE,
∴ΔABC≌ΔADE.
只是需要全等吧.