设∠DOB=x,∠DOC=3x,
∠EOD=65°
∠BOE=65-x
OE平分∠AOB
2∠BOE+∠DOC=180
130-2x+3x=180 x=50
∠DOC=150°
或∠BOE=x-65
(180-3x)/2=x-65
180-3x=2x-130
5x=210
x=42
∠DOC=126°
设∠DOB=x,∠DOC=3x,
∠EOD=65°
∠BOE=65-x
OE平分∠AOB
2∠BOE+∠DOC=180
130-2x+3x=180 x=50
∠DOC=150°
或∠BOE=x-65
(180-3x)/2=x-65
180-3x=2x-130
5x=210
x=42
∠DOC=126°