①在△AEO与△ADO中∵CE⊥AB于点E，BD⊥AC于点D，AO平分∠BAC，∴∠AEO=∠ADO=90°，∠EAO=∠DAO∵AO=AO∴△AEO≌△ADO（AAS）∴AE=AD，OE=OD；②在△OBE与△OCD中∵∠OEB=∠0DC=90°，∠EOB=∠DOC，OE=OD∴△OBE≌...