已知A,B,C三点在同一直线上,∠DAE=∠AEB,∠D=∠BEC,
(1)求证:BD∥CE;
(2)若∠C=70°,∠DAC=50°,求∠DBE的度数.
(1)求证:BD∥CE;
(2)若∠C=70°,∠DAC=50°,求∠DBE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/26/8a6fedb1-2199-47d1-aeaf-8b9b623f6389.png?resizew=212)
18-19七年级下·广东珠海·期末 查看更多[9]
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更新时间:2019-08-03 22:55:10
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【知识点】 根据平行线判定与性质求角度解读
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,
平分
,交
于点
,点
在线段
上(不与点
,点
重合),连接
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/652ae6c5-7225-4b42-8559-f90d87139f96.png?resizew=142)
(1)试判断
与
是否平行,并说明理由;
(2)探索
,
,
三者之间的等量关系,并说明理由;
(3)若
,且
(
,
为常数,且为正数),求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd46ddb0d83684031260aeac5cd5cb0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/652ae6c5-7225-4b42-8559-f90d87139f96.png?resizew=142)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af342d3b871ace448ccc7c648528288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61123f663c231f0536d31dfa071375d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8349b1776a38935422a941674e1fc39.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b07a6056d6604d5793690bf3bf0a38d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba73b2383195317544bf0806b5db9e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0be44077d42cfffece905b1af13e000.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,直线
分别与直线
,
交于点
,
,
平分
,
平分
,且
.
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
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(1)求证:
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7218ba90f22ab7ae104d16cf92b406.png)
您最近一年使用:0次