如图OE平分角bod且角aod-角dob=80度

设角AOD为X因为角AOC加角AOD为180度则角AOD=角AOC+80X+X+80=180得X=50因为对顶角所以AOC=DOB=50因为OE评分角DOB所以角BOE=1/2角BOD=1/2成50度

自己写、、、再问：..................

∵∠COD是平角=180°∴∠BOD+∠BOC=2∠BOC+30°=180°∴∠BOC=75°∴∠AOD=∠BOC=75°(对顶角相等)又∵OE是角平分线∴∠EOA=37.°5又∵∠AOC=∠BOD=

∵AOB在一条线上∴∠AOB=180°∴∠AOD+∠DOB=180°∵∠AOD-∠DOB=80°∴∠AOD=130°,∠BOD=50°∴∠AOC=∠BOD=50°

图中C、E标反了吧（1）∵∠AOE=140°∴∠BOE=40°∴∠DOE=40°,∠BOD=80°∴∠AOD=100°,∠AOC=50°（2）∵∠COE=90°,∠EOD：∠COD=2:3∴∠EOD=

/>∵直线CD∴∠AOC+∠AOD＝180∵∠AOC＝∠AOD-80∴2∠AOD-80＝180∴∠AOD＝130∴∠BOD＝180-∠AOD＝180-130＝50∵OE平分∠BOD∴∠DOE＝∠BOD

设∠DOE=x,则∠AOC=2x,又∠AOC+∠AOD=180°,∴∠AOD=180°-∠AOC=180°-2x又∠AOC=∠AOD-80°,∴2x=180°-2x-80°,解得x=25°

∠AOC=∠AOD-80°,又∠AOC=180°－∠AOD∴∠AOD=130°,∠AOC=50°∴∠BOD=50°∴∠DOE=25°∴∠AOE=130°＋25°=155°

∵直线AB,CD相交于点O∴∠AOC=∠BOD,∠AOC+∠AOD=180°又∵∠AOC比∠AOD小80°∴∠AOC+80°=∠AOD∴∠AOC+∠AOC+80°=180∴∠AOC=50°∴∠BOD=

因为OC平分角AOD,OE平分角BOD.所以∠AOC＝∠COD,∠BOE＝∠DOE因为A,O,B在一条直线上,所以∠AOC＋∠COD＋∠BOE＋∠DOE＝180度所以∠COD＋∠DOE＝90度,∠CO

互余的角：∠BOE和∠DOC ∠BOE和∠AOC            

∠AOD比∠AOE大75°,即∠AOD=∠AOE+75°,OE为∠AOC平分线,即∠AOE=∠COE,那么∠COE+∠AOE+∠AOD=2∠AOE+∠AOE+75°=180°,得出∠AOE=35°,那

∵OE平分∠BOD∴∠DOE=1/2∠BOD∵OC平分∠AOD∴∠COD=1/2∠AOD∴∠COE=1/2(∠AOD+∠BOD)=1/2*78=39°

22.5°再问：麻烦您说下过程！谢谢！再答：∠DOE=0.5∠AOD∠DOF=0.5∠BOD∠EOF=∠DOE+∠DOF=0.5∠AOD+0.5∠BOD=0.5∠AOB=22.5°

OE评分角BOD,∠AOD︰∠BOE=7︰1∠AOD︰∠BOD=7︰2∠AOD+∠BOD=180º∠AOD=180º×7/(7+2)=140º,∠BOD=60º

角AOC=角AOD-80所以角AOD-角AOC=80,又因为角AOC加上角AOD等于180,所以能求出角AOD=130角AOC等于50度.又因为角AOC和角DOB是对等角,所以角DOB也等于50度OE

∵oc平分∠AOD∴∠DOC=∠AOC∵OE平分∠BOD∴∠BOE=∠EOD∵∠EOC=∠DOE+∠DOC∴∠AOB=∠BOD+∠DOA=2∠DOE+2∠DOC=2(∠DOE+∠DOC)=2∠EOC=

∠AOE=∠AOC_∠COE=15∠AOB=2∠AOE=30∠AOD=∠BOD+∠AOB=120

∠BOD+∠AOD=180°所以1/2×∠BOD+1/2×∠AOD=90°因为OC,OE分别是∠BOD和∠AOD的角分线所以∠COD=1/2×∠BOD,∠EOD=1/2×∠AOD因为∠COD+∠EOD

1.由CO,EO平分∠BOD与∠AOD,可得：∠AOE=∠EOD=∠AOD/2,∠DOC+∠COB=∠BOD/2,而∠AOE+∠EOD+∠DOC+∠COB=180度,所以有2(∠AOE+∠DOC)=1