如图1,已知点O是直线AB上一点,射线OC平分∠BOE,∠COD=90°,且点C,D位于直线AB异侧.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894083421159424/2950440676278272/STEM/6c22167d-bfa1-461f-9b5f-75f0cff41dab.png?resizew=472)
(1)①若∠DOE=160°,求∠AOE的度数;
②求∠AOE与∠BOD的数量关系;
(2)若点E,F在直线AB异侧,射线OF在∠BOD的内部,若∠COE+∠AOF=180°,且∠AOE=4∠DOF,在图2中画出完整的图形,并直接写出∠BOE的度数.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894083421159424/2950440676278272/STEM/6c22167d-bfa1-461f-9b5f-75f0cff41dab.png?resizew=472)
(1)①若∠DOE=160°,求∠AOE的度数;
②求∠AOE与∠BOD的数量关系;
(2)若点E,F在直线AB异侧,射线OF在∠BOD的内部,若∠COE+∠AOF=180°,且∠AOE=4∠DOF,在图2中画出完整的图形,并直接写出∠BOE的度数.
更新时间:2022-04-03 22:29:50
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解答题-问答题
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【推荐1】如图,直线
,
相交于点
,
平分
.
![](https://img.xkw.com/dksih/QBM/2023/4/27/3225397309833216/3226088630919168/STEM/c491fecca98046ed965c3950c7ead2f3.png?resizew=151)
(1)写出图中
的所有补角;
(2)若
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的度数;
(3)若
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的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)写出图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
(2)若
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(3)若
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【推荐2】如图,点O是直线AE上的一点,OC是∠AOD的平分线,∠BOD=
∠AOD.
(1)若∠BOD=20°,求∠BOC的度数;
(2)若∠BOC=n°,用含有n的代数式表示∠EOD的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)若∠BOD=20°,求∠BOC的度数;
(2)若∠BOC=n°,用含有n的代数式表示∠EOD的大小.
![](https://img.xkw.com/dksih/QBM/2020/3/26/2427650563260416/2428771265396736/STEM/dbe8ed6d3aa3483287ca2cc8bd9325fb.png?resizew=222)
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【推荐1】如图,直线AB与CD相交于点O,OD平分∠BOE,∠FOD=90°,问OF是∠AOE的平分线吗?请你补充完整小红的解答过程.
探究:
(1)当∠BOE=70°时,∠BOD=∠DOE=
×70°=35°,∠EOF=90°﹣∠DOE= °,而∠AOF+∠FOD+∠BOD=180°,所以∠AOF+∠BOD=180°﹣∠FOD=90°,所以∠AOF=90°﹣∠BOD= °,所以∠EOF=∠AOF,OF是∠AOE的平分线.
(2)参考上面(1)的解答过程,请你证明,当∠BOE为任意角度时,OF是∠AOE的平分线.
(3)直接写出与∠AOF互余的所有角.
探究:
(1)当∠BOE=70°时,∠BOD=∠DOE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)参考上面(1)的解答过程,请你证明,当∠BOE为任意角度时,OF是∠AOE的平分线.
(3)直接写出与∠AOF互余的所有角.
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854423579074560/1855160581791744/STEM/d6acb8b5290347238f610acc2a2087a0.png?resizew=187)
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【推荐2】(1)如图,在正方形
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(2)已知,如图
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