如图,已知直线
相交于点O,∠2=2∠1,∠3=3∠2,求∠DOE的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6baf19227f26a4bf27be5b428672d9.png)
![](https://img.xkw.com/dksih/QBM/2019/2/15/2141291458633728/2143385766395904/STEM/67c3ea54b7c846c1b376d9ba196cd385.png?resizew=160)
更新时间:2017-09-26 16:32:18
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【推荐1】如图,直线AB、CD相交于点O,OE平分∠DOB,若∠AOC=40º,求∠AOE的度数.
![](https://img.xkw.com/dksih/QBM/2019/9/26/2298875836243968/2299257913589760/STEM/24b992de0ee545e298fcdbc141c83939.png?resizew=160)
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【推荐2】
中,
,点D,E分别是
边
,
上的点,点P是一动点.设
,
,
.
上,如图(1)所示,且
,则
___________°;
(2)若点P在线段
上运动,如图(2)所示,则
,
,
三者之间的关系为:___________.
(3)若点P运动到边
的延长线上,如图(3)所示,则
,
,
三者之间有何关系?请写出你的猜想并说明理由;
(4)若点P运动到
外且在直线
的上方、直线
的左侧范围内运动时,请探究
,
,
之间的关系(画图并直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307773456102f4d7ea664385029acdc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004fffe57568c3cb76d43794584da944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4626c693586583b09c3008f1d81a76a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0664699cab2130e2b8fb5d976848418b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa61f1be96d581867ea9f074420a2252.png)
(2)若点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(3)若点P运动到边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(4)若点P运动到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
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【推荐1】如图,直线AB与CD交于点O,OE⊥AB于点O,∠EOD∠DOB=31,求∠COE的度数.
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880535181443072/1880842753277952/STEM/b5e23808bf3145f6a1edef5d1963c9b6.png?resizew=176)
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【推荐2】如图,直线AB、CD相交于O,OE⊥CD,且∠BOD的度数是∠AOD的5倍.
求:(1)∠AOD、∠BOD的度数;(2)∠BOE的度数.
求:(1)∠AOD、∠BOD的度数;(2)∠BOE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/28/649cb6f9-0193-4edf-ae64-23eadbc31051.png?resizew=164)
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