设∠AOC为x, 则∠COD为x
设∠DOE为y, ∵∠DOE=1/3∠BOD, ∴∠BOE=2y
∵∠AOC+∠COD+∠DOE+∠EOB=180°
∠COD+∠DOE=72°
∴ x+x+y+2y=180
x+y=72
得: x=36, y=36
∴ ∠EOB=2y=72°
设∠AOC为x, 则∠COD为x
设∠DOE为y, ∵∠DOE=1/3∠BOD, ∴∠BOE=2y
∵∠AOC+∠COD+∠DOE+∠EOB=180°
∠COD+∠DOE=72°
∴ x+x+y+2y=180
x+y=72
得: x=36, y=36
∴ ∠EOB=2y=72°