如图,
与
相交于点
,
与
相交于点
,如果
,
,
,那么
与
平行吗?
与
呢?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4e0de0c1de0835766b7f627f348c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8892182595abb470943ea5d90aedafc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
22-23七年级下·陕西安康·阶段练习 查看更多[3]
陕西省安康市汉阴县2022-2023学年七年级下学期3月月考数学试题(已下线)5.2.2平行线的判定 课后作业C层(已下线)专题2.8 探索直线平行的条件(知识梳理与考点分类讲解)-2023-2024学年七年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2023-09-06 21:54:59
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图,
,
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/9561f8b5-ef7f-43c9-b7e3-af008f8b2b18.png?resizew=186)
证明:∵
(已知)
(____________)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd26c1bff3bb1de35650a46e53a9cde.png)
∴
(____________)
∴
(____________)
∵
(已知)
∴
.
即
,
∴
(____________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682dc163baa74e18746d3d52da6cff7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f6cce6e8470961c21d5cbbde1ed224.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/9561f8b5-ef7f-43c9-b7e3-af008f8b2b18.png?resizew=186)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1732361ed319691e9a7a5318ba54b60.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd26c1bff3bb1de35650a46e53a9cde.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e761b398fcac475fe25be23ba35856.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682dc163baa74e18746d3d52da6cff7e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0403b866808f3749b09f9e8a7936e9d9.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a11c34f8c89075543ee9bb483bdfe0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f6cce6e8470961c21d5cbbde1ed224.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图1,∠MON=90°,直角三角板的直角顶点C落在∠MON的内部,两条直角边AC、BC分别与OM、ON交于点D和点E.
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716502271213568/2767640631377920/STEM/5d3d809a42ec4236af01b2f2b8ad4e47.png?resizew=505)
(1)填空:∠OEC+∠ODC= ;
(2)连接DE,若DE平分∠ODC,试说明DE平分∠OEC;
(3)如图2,若EF平分∠CEO,交AC于点F,DG平分∠MDC,则DG与EF的位置关系是什么?请说明理由;
(4)如图3,改变直角三角板的位置,使直角边BC与ON的反向延长线交于点E,其他条件不变,若DG平分∠MDC,EF平分∠CEO,试说明此时DG与EF的位置关系是什么?请说明你的理由.
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716502271213568/2767640631377920/STEM/5d3d809a42ec4236af01b2f2b8ad4e47.png?resizew=505)
(1)填空:∠OEC+∠ODC= ;
(2)连接DE,若DE平分∠ODC,试说明DE平分∠OEC;
(3)如图2,若EF平分∠CEO,交AC于点F,DG平分∠MDC,则DG与EF的位置关系是什么?请说明理由;
(4)如图3,改变直角三角板的位置,使直角边BC与ON的反向延长线交于点E,其他条件不变,若DG平分∠MDC,EF平分∠CEO,试说明此时DG与EF的位置关系是什么?请说明你的理由.
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知点
在
上,
平分
,
平分
.
;
(2)若
,
,则
与
平行吗?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeeee5f39ee6f9c3ea01ada75d63b93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91bb3e5212857c1a099b9cb7f9a6af38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ca775b81195fffe5bcb3ae613e5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四边形
中,
,
,
,
平分
,与
相交于点
,
平分
,与
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/11c82330-4f02-439f-8603-56479bff8209.png?resizew=177)
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31ccc24ef6725093d4717718287ca1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb34d917a073024625616e4edf22016.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/11c82330-4f02-439f-8603-56479bff8209.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550b15375a54ce849585b60bc42d2dd1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知:
是等边三角形,点D、E分别为边
上的点,且
,连接
,相交于点F.
(1)求证:
;
(2)求
的度数;
(3)延长
到点G,使
,连接
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887721a843b2dc8e947cc42d09868e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15204b24dd62067316fee9abab2bf73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/8c24d392-5bc0-44f3-bf7d-d14ee396c569.png?resizew=120)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2524a121b46f521cb7d86352ce169fef.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
(3)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49989cb8ad7f509a24829dbd3c0fb8ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01430ca150d13745c6e0024b1d91cc88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5491e85be09f6192fde28899c4e57fb.png)
您最近一年使用:0次