如图,已知在
中,
,AE是BC边上的高,AD是
的角平分线,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e4e2717c5c61f8461c945717a6b4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/c81c345f-7340-45ae-8315-707be7e61cbe.png?resizew=283)
21-22七年级下·吉林长春·期中 查看更多[10]
吉林省东北师范大学附属中学净月实验学校2021-2022学年七年级下学期期中数学试卷(已下线)专题11.26 《三角形》全章复习与巩固(知识讲解)-2022-2023学年八年级数学上册基础知识专项讲练(人教版)吉林省长春市净月实验中学2021-2022学年七年级下学期期中数学试题湖南省长沙市湖南师大附中博才实验中学2022-2023学年八年级上学期入学考试数学试题(已下线)第七章 平行线的证明(B卷·能力提升练)-【单元测试】2022-2023学年八年级数学上册分层训练AB卷(北师大版,广东专用)江苏省南京市鼓楼区鼓楼实验中学2022-2023学年七年级下学期3月月考数学试题吉林省长春市双阳区第一六二中学2022-2023学年七年级下学期5月月考数学试题山东省济南市天桥区济南第二十九中学2022-2023学年七年级下学期期中数学试题四川省绵阳市涪城区2023-2024学年八年级上学期10月月考数学试题江苏省南京市江宁区竹山中学2023-2024学年七年级下学期3月月考数学模拟试题
更新时间:2022-06-30 12:14:33
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解答题-问答题
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【推荐1】如图,直线
,
相交于点O,
,
平分
,
.
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759279603400704/2824741269487616/STEM/0a869149-e4e1-4e9d-9666-5deeaba3b42c.png?resizew=175)
(1)求
和
的度数(用含x的式子表示):
(2)当x为何值时?
.
![](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/1cff606045e964c1ca1948eadb44c2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d78a3526ddada5380cefb43b3e18c2.png)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759279603400704/2824741269487616/STEM/0a869149-e4e1-4e9d-9666-5deeaba3b42c.png?resizew=175)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
(2)当x为何值时?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c4fee5e95c0d6e9875de0e9ab81f2c.png)
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解答题-证明题
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【推荐2】如图,
平分
,
,试说明
.
证明:∵
平分
( ),
∴
( ),
又∵
( ),
∴
( ),
∴
( ).
![](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/b0fff774b4b0087a6f304ce930d359be.png)
证明:∵
![](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/207c37b4e9eb8c53fd2ae13c7afe92dc.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1503237215798ab4694f90a3a5390787.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8099c774a6ae6dd98712b0b90b60cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/35380d44-5ebb-4414-a53a-b97c15e1a07d.jpg?resizew=150)
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解答题-证明题
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【推荐1】如图,在
中,
,
,点
是
边上一点,且
,过点
作
于点
,与
交于点
,过点
作
,垂足为点
.
(1)求证:
;
(2)判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e95be88bc79b3c7e72d349c4cb3c88d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb25434985431dcc5c33fcbb3354b786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/19f6a2a7-264b-40c2-8184-9d68f819e33c.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf33884841b7bb0256dfb88dd2832308.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
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【推荐1】“一线三等角”模型是平面几何图形中的重要模型之一,“一线三等角”指的是图形中出现同一条直线上有3个相等的情况,在学习过程中,我们发现“一线三等角”模型的出现,还经常会伴随着出现全等三角形.
根据对材料的理解解决以下问题∶
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/dc0a7612-5840-45b2-9be3-488c4c36253c.png?resizew=552)
(1)如图1,
,
.猜想
,
,
之间的关系:__________
(2)如图2,将(1)中条件改为
,
,请问(1)中的结论是否成立?若成立,请给出证明;若不成立,请说明理由;
(3)如图3,在
中,点
为
上一点,
,
,
,
,请直接写出
的长.
根据对材料的理解解决以下问题∶
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/dc0a7612-5840-45b2-9be3-488c4c36253c.png?resizew=552)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6abaa9d18e162e0601889398a5823337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,将(1)中条件改为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dccbdea5a79a1eb3ec5124adfab15dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8289f5dabd85890bfe7b0222c7cf93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e82a0052299f414cff1e7afcc5aa19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-作图题
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名校
【推荐2】如图,在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/81191c23-5a3d-4a85-8da9-9ebb283f5a38.png?resizew=226)
(1)用尺规在
上作点
,连接
,使得
.(保留作图痕迹,不写作法)
(2)在(1)的条件下,若点
分别到
和
的距离相等,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/81191c23-5a3d-4a85-8da9-9ebb283f5a38.png?resizew=226)
(1)用尺规在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a606499df4459e5fbd6021c61a805359.png)
(2)在(1)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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