∵OD平分∠COE∴∠COE＝2∠DOE＝72,∠DOC＝∠DOE＝36∵OC平分∠AOE∴∠AOC＝∠COE＝72∵∠AOB＝1/4∠AOC∴∠AOB＝1/4×72＝18∴∠BOC＝∠AOC-∠AOB＝72-18＝54∴∠BOD＝∠BOC+∠DOC＝54+36＝90°这是我之前的回答,请...