（1）∵直线AB、CD交于点O，∴∠AOC=∠BOD，∵OE平分∠AOC，OF平分∠BOD，∴∠COE=12∠AOC，∠DOF=12∠BOD，∴∠COE=∠DOF；（2）∵OE平分∠AOC，∴∠AOE=∠COE，∴∠COE=∠DOF，∴∠AOE+∠AOF=∠COE+∠AOE+∠AOD=18...