如图,已知AB∥CD,E在AB与CD之间,且∠B=40°,∠D=20°.求∠BED的大小.
![](https://img.xkw.com/dksih/QBM/2019/2/19/2143989596938240/2148126927609856/STEM/2cfa6f7fd35240ca96da60e663b8068b.png?resizew=170)
更新时间:2019-01-10 14:26:54
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【知识点】 根据平行线的性质探究角的关系解读
相似题推荐
解答题-问答题
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适中
(0.65)
名校
【推荐1】如图1,已知
,点
在
上,连接
.过点
作
.连接
.
(1)若
,求
的度数:
(2)如图2,
平分
,射线
的反向延长线交
的平分线于点
,试探究
与
之间的数量关系并说明理由.
(3)在(1)的条件下,点
为直线
上的一动点,连接
.直接写出
与
之间的数量关系,(题中所有角都是大于0°且小于180°的角)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6768140937d815860e4e9121e570c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7724af2445c723d1392aed54d210ed3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
(3)在(1)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af342d3b871ace448ccc7c648528288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61123f663c231f0536d31dfa071375d6.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
,点A、D在直线MN上,点E在直线BC上,连接AB、BD、CD、DE,且
,且
,DC是
的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/42453e6a-eee7-4f35-9e9f-796567915a7a.png?resizew=147)
(1)AB与DE平行吗?请说明理由;
(2)试说明
;
(3)试说明BD是
的平分线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1dc52a8ba9f389800eb92dbd145bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f0d3d800ff70b765756ead8ca8d089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6536e6f106f2829c62f1536f34c092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674eb0f94169916b89439ea78d3f1da7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/42453e6a-eee7-4f35-9e9f-796567915a7a.png?resizew=147)
(1)AB与DE平行吗?请说明理由;
(2)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727658b00efa0920188efb4051a3c92c.png)
(3)试说明BD是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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