题目内容

如图,(1)∠AOC=______+______=______-______;
(2)∠AOD-∠AOB=______=______+______;
(3)∠BOC=______-______-______=∠AOC-______=______-∠COD.
(1)∠AOC=∠AOB+∠BOC=∠AOD-∠COD
(2)∠AOD-∠AOB=∠BOD=∠BOC+∠COD
(3)∠BOC=∠AOD-∠AOB-∠COD=∠AOC-∠AOB=∠BOD-∠COD
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