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People's Education Edition, the seventh grade mathematics textbook, Volume I, page 58, the answer.
The title is: As shown in the figure, OB is the bisector of ∠AOC and OD is the bisector of ∠COE.

(1) If ∠AOB

=

40,∠DOE

=

30. ∠ What is ∠BOD?

(It can't be directly explained by the diagram: ∠AOC is 80, ∠COE is 60).

(2) If ∠AOE

=

140 ∠COD

=

30, ∠ How many degrees is ∠AOB?

I know this topic is stupid, because people know the answer, but you must ask.

Come on, you're a god. I want to answer the question.