如图,为了加固房屋,要在屋架上加一根横梁DE,使DE//BC.如果∠ABC=31°,∠ADE应为多少度?
![](https://img.xkw.com/dksih/QBM/2021/10/11/2826921173884928/2826967584432128/STEM/ae24d14a-d543-4178-83a8-8affa84ef064.png)
20-21七年级下·全国·课后作业 查看更多[1]
(已下线)【人教版课时练习】七年级下册数学第五章相交线和平行线5.2.2 平行线的判定
更新时间:2021-10-11 11:43:11
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【知识点】 根据平行线的性质求角的度数解读
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解答题-问答题
|
容易
(0.94)
【推荐1】如图,
,
,
,垂足为P.如果
,那么
和
分别等于多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9cc98e6df306063e645044f0faa7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d221944148d71e2e1bc76040aefb8d.png)
![](https://img.xkw.com/dksih/QBM/2021/11/13/2850624311140352/2853359004655616/STEM/828c9530-2929-4907-9911-af31981f9cfb.png)
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解答题-证明题
|
容易
(0.94)
【推荐2】如图,已知
.
(1)如图1,求证:
;
![](https://img.xkw.com/dksih/QBM/2019/9/26/2299056758472704/2299098922360832/STEM/9e4851357b544b0f86c1ba14c5e6b0e9.png?resizew=107)
(2)
为
,
之间的一点,
,
,
平分
交
于点
,
如图2,若
,求
的度数;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbc779175ff7c5beebb7c258aca08d6.png)
![](https://img.xkw.com/dksih/QBM/2019/9/26/2299056758472704/2299098922360832/STEM/9e4851357b544b0f86c1ba14c5e6b0e9.png?resizew=107)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/af5b3967aa677f18e92912d2397f4907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3b8aeb843aec6db94a5f05a545a6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34868b311f1082fb003dec7f07cdfd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e56882a4046fe6a48b4dd60138a3f03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/2019/9/26/2299056758472704/2299098922360832/STEM/5865bbaed8034f189fc48ea7fe2f8e5f.png?resizew=120)
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