如图,在
中,
,
,
分别是
的高和角平分线,
,
.
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145432236359680/3146145808605184/STEM/6b89201eddb441809824babca834d873.png?resizew=177)
(1)求
的度数.
(2)求
的度数.
(3)探究:如果只知道
,那么能得到
的度数吗?若能,请你写出求解过程;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6f337c00a6d4bf1e7580d8888db3d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea8d2436104194afbfb66c3fe9bbb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b3c19f960629fb9cb5c4e1b3cecf00.png)
![](https://img.xkw.com/dksih/QBM/2023/1/4/3145432236359680/3146145808605184/STEM/6b89201eddb441809824babca834d873.png?resizew=177)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(3)探究:如果只知道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f8cd488430b0a21925f818e3988271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
2022八年级上·全国·专题练习 查看更多[2]
(已下线)专题7.5 三角形内角和定理(专项训练)-2022-2023学年八年级数学上册《同步考点解读·专题训练》(北师大版)西藏自治区拉萨市墨竹工卡县中学2022-2023学年八年级上学期期中数学试题
更新时间:2023-01-05 10:32:56
|
相似题推荐
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)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图1,在平面直角坐标系中,
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/2a71a522-c995-4a1d-968f-89c9a448061c.png?resizew=360)
(1)求a,b的值;
(2)在y轴的上存在一点M,使
,求点M的坐标;
(3)如图2,过点C作
轴交y轴于点D,点P为线段
延长线上一动点,连接
平分
,
.当点P运动时
的值是否会改变?若不变,求其值;若改变,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7799d713e6f2be4cb542b0372916a25e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552a77a57b08d26bc38e31b653c194dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fea0d424f3c527babed70ef6cf646e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b580bf69eb8a4c8819c41f3b16f8e153.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/2a71a522-c995-4a1d-968f-89c9a448061c.png?resizew=360)
(1)求a,b的值;
(2)在y轴的上存在一点M,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b778d2f43e5531a611c7550821846e.png)
(3)如图2,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4facfc5447ae7f665e8ec050b81313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c2fd4241eff3e8f833f7981161431c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3a3bf63440a2fdd769162516fb0e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f2a7ebf0bb96fbe9fc9dabb63a8c12.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,且
,D是
的中点,E是
延长线上一点,
交
的延长线于F,
的延长线交
的延长线于点G,连接
.
;②
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafd03ec652033d4c242e6fa175d4e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5082a1cb24082cc7c79b19029f4bab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8d41c54beede24974b3cd00afe1184.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6948045214d381195319f78f355b8190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b0b831b56c1a03925d0f5a332d8ded.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,△ABC中,AB = AC,∠A = 36°,AC的垂直平分线交AB于E,ED⊥AC,D为垂足,连接EC.
(1)求∠ECD的度数;
(2)若CE = 8,求BC长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/90aefa51-cdaa-4ceb-a481-8d875651d61f.png?resizew=113)
(1)求∠ECD的度数;
(2)若CE = 8,求BC长.
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