1 . 如图,四边形
中,
,
平分
,
平分
,试问
与
平行吗?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c055da7b52cc1516fe5e7d7b7e080212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2021/10/21/2833980987850752/2837030351781888/STEM/282227f6-9eec-455f-800e-a624a049dbe9.png?resizew=207)
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2021-10-25更新
|
399次组卷
|
4卷引用:第七章 相交线与平行线 7.2探索直线平行的条件
20-21七年级下·全国·课后作业
2 . 如图,
,
,
分别是
,
的平分线.求证
.
![](https://img.xkw.com/dksih/QBM/2021/10/11/2826921650954240/2826968215642112/STEM/f1c80af7-f0ef-454c-bc49-a51dd1b537b9.png)
证明:∵
,
分别是
,
的平分线,
∴
,
________(________________).
又
,
∴
.
∴
(________________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec87eb5a280949907724ccfcf86ae203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46c836f4108d26b7ac0b45cc872816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e901d726bbf7efbfd6512a393de8aab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/2021/10/11/2826921650954240/2826968215642112/STEM/f1c80af7-f0ef-454c-bc49-a51dd1b537b9.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46c836f4108d26b7ac0b45cc872816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e901d726bbf7efbfd6512a393de8aab5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c1c28a7e5fbd1008e3de19dfd76cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec87eb5a280949907724ccfcf86ae203.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f025ac7d3a25750f2b83c42ed4261f8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
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2011七年级下·河南周口·专题练习
名校
3 . 如图,
平分
,
.填空:因为
平分
,所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
________ .从而![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
________ .因此![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/e1b761a7-4676-4e34-b435-abe24eea141d.png?resizew=192)
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2021-10-11更新
|
1441次组卷
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7卷引用:【人教版课时练习】七年级下册数学第五章相交线和平行线 测试题
(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 测试题(已下线)2011年河南省周口市初一下学期相交线与平行线专项训练(已下线)2010-2011学年河南省周口市初一下学期平面直角坐标系单元测试浙教版七年级下册第1章单元测试卷人教版七年级数学下册第五章相交线与平行线单元测试卷广东省江门市第二中学2021-2022学年七年级下学期开学综合训练数学试题甘肃省陇南市康县2021-2022学年七年级下学期期末数学试题
4 . 平行四边形的一组对角的平分线( )
A.一定相互平行 | B.一定相交 | C.可能平行也可能相交 | D.平行或共线 |
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5 . 已知:如图,O是
的内角
和外角
的平分线的交点.
![](https://img.xkw.com/dksih/QBM/2021/10/3/2821503322636288/2822018569953280/STEM/23a86e91-0339-46a2-9619-99461f2beeff.png)
(1)若
,求
;
(2)若
,用n的代数式表示
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://img.xkw.com/dksih/QBM/2021/10/3/2821503322636288/2822018569953280/STEM/23a86e91-0339-46a2-9619-99461f2beeff.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d545cb81edcdaf8c267bc4b3f19c53ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
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名校
6 . 如图,在
中,
,AD平分
,
于点F,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fb7cc752222306029fabbeb894a800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953b7b5c647641edbec4c2ab90a65f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
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2021-10-04更新
|
1107次组卷
|
5卷引用:人教版七年级下 第十二章 全等三角形 12.2 三角形全等的判定(6)
7 . 要将如图中的
平分,小梅设计了如下方案:在射线OM,ON上分别取
,过点A作
交ON于D,过B作
交OM于E,AD、EB交于点C,过点O、C作射线OC即为
的平分线,试说明这样做的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b76d76d91b21a5be2bb58446c7104bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afdf06eea71821999e16fba583cc3e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://img.xkw.com/dksih/QBM/2021/10/3/2821502194040832/2821860933427200/STEM/0eeb0d02-cddc-48f8-b36d-51063d0ebf9d.png)
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8 .
中,三个角的平分线交于O点,
于E,试猜想
和
的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c4bcc71c6ba24301e364c29a6a05a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
![](https://img.xkw.com/dksih/QBM/2021/10/3/2821502955700224/2821586944983040/STEM/ccc1629d-eede-4178-91e5-55c84004254d.png)
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名校
9 . 如图,ABCD为一长条形纸带,AB∥CD.将ABCD沿EF折叠,A、D两点分别与A'、D'对应,若∠1=2∠2,则∠CFD'的度数为______ .
![](https://img.xkw.com/dksih/QBM/2021/7/25/2771739248066560/2820567967014912/STEM/56a7b0c4-ac39-4394-a395-03870f8ffd6d.png?resizew=251)
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2021-10-02更新
|
250次组卷
|
6卷引用:专题1.25 平行线(折叠问题)(基础篇)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(浙教版)
(已下线)专题1.25 平行线(折叠问题)(基础篇)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(浙教版)安徽省合肥寿春中学2020-2021学年七年级下学期期末数学试题 河南省郑州市高新区枫杨外国语中学2020-2021学年七年级下学期第一次月考数学试卷安徽省蚌埠市2021-2022学年七年级下学期期末数学试题安徽省蚌埠市固镇县2021-2022学年七年级下学期期末数学试题河南省郑州市二七区郑州市第八十一中学2021-2022学年七年级下学期第一次学情诊断数学试题
10 . 如图,
中,
是
的角平分线,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22465f31a3d3d0d6e02b196329d0fec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbfc35fc915ac7d4dc017e60ccdecbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34323137ddb894a70d97511aa5fe6f98.png)
![](https://img.xkw.com/dksih/QBM/2021/9/22/2813518968913920/2813775692218368/STEM/4d42323a-dcee-420d-af1f-11f9ddc17391.png?resizew=187)
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