如图,OC是∠AOB的平分线,OD平分∠AOC,且∠COD=20°,则∠AOB=_____ .
![](https://img.xkw.com/dksih/QBM/2016/12/27/1633715925934080/1633715926138880/STEM/b71f4f6e802846ab83f6f9839b14e258.png?resizew=125)
更新时间:2017-02-28 14:26:28
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【推荐1】如图,已知OC是∠AOB内部的一条射线,∠AOC=30°,OE是∠COB的平分线.当∠BOE=40°时,则∠AOB的度数是_____ .
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366057943105536/2368365463822336/STEM/0edc424a96244907b15365066117b82c.png?resizew=148)
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【推荐2】如图,平行四边形
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