应该是∠DOE=2∠BOD吧
∵直线AB
∴∠AOB=180
∵∠AOB=∠AOD+∠BOD
∴∠AOD=∠AOB-∠BOD=180-∠BOD
∵OE平分∠AOD
∴∠DOE=∠AOD/2=(180-∠BOD)/2=90-∠BOD/2
∵∠DOE=2∠BOD
∴2∠BOD=180-∠BOD/2
∴∠BOD=72
∵直线AB、CD相交于点O
∴∠AOC=∠BOD
∴∠AOC=72
应该是∠DOE=2∠BOD吧
∵直线AB
∴∠AOB=180
∵∠AOB=∠AOD+∠BOD
∴∠AOD=∠AOB-∠BOD=180-∠BOD
∵OE平分∠AOD
∴∠DOE=∠AOD/2=(180-∠BOD)/2=90-∠BOD/2
∵∠DOE=2∠BOD
∴2∠BOD=180-∠BOD/2
∴∠BOD=72
∵直线AB、CD相交于点O
∴∠AOC=∠BOD
∴∠AOC=72