如图,直线AB和CD相交于点O,OE平分∠DOB,∠AOC=40°,则∠DOE=__ 度.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110708639776768/2113698359623681/STEM/de658df2056242d09fac62675b619a46.png?resizew=136)
更新时间:2019-01-07 22:26:49
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【推荐1】如图所示,
和
都是等腰直角三角形,
,
平分
,连接
、
,取
的中点
,连接
,若
,则
与
的面积之比为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,
,
的角平分线
的反向延长线和
的角平分线
交于点F,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b83764876be47a196fd5f408763738a.png)
________ .
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