题目内容
如图,∠AOB=130°,射线OC是∠AOB内部任意一条射线,OD、OE分别是∠AOC、∠BOC的平分线,下列叙述正确的是( )
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A.∠DOE的度数不能确定
B.∠AOD+∠BOE=∠EOC+∠COD=∠DOE=65°
C.∠BOE=2∠COD
D.∠AOD=
∠EOC
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A.∠DOE的度数不能确定
B.∠AOD+∠BOE=∠EOC+∠COD=∠DOE=65°
C.∠BOE=2∠COD
D.∠AOD=
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B
∵OD、OE分别是∠AOC、∠BOC的平分线,
∴∠AOD=∠COD,∠EOC=∠BOE.
又∵∠AOD+∠BOE+∠EOC+∠COD=∠AOB=130°,
∴∠AOD+∠BOE=∠EOC+∠COD=∠DOE=65°,故选B.
∴∠AOD=∠COD,∠EOC=∠BOE.
又∵∠AOD+∠BOE+∠EOC+∠COD=∠AOB=130°,
∴∠AOD+∠BOE=∠EOC+∠COD=∠DOE=65°,故选B.
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