∠EOF=75°解：∵∠AOD:∠BOE=4:1，∠AOD=∠COB∴∠COB:∠BOE=4:1∵OE平分∠BOD∴∠EOD=∠BOE∴∠COB:∠BOE：∠EOD=4:1：1又∵∠COB+∠BOE+∠EOD=180°∴∠COB=120°，∠BOE=30°，∠EOD=30°∴∠COE=∠COB+∠BOE=150°∵OF平分∠COE∴∠FOE=∠COE/2=75°
