在
中,
与
的角平分线交于点D,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/23/1eb627a2-0e69-4184-aa6b-9f1210ccd541.png?resizew=152)
(1)求角B的大小;
(2)若
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0621ef38677882a64752aff9ac4d1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/23/1eb627a2-0e69-4184-aa6b-9f1210ccd541.png?resizew=152)
(1)求角B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
23-24高一下·吉林·期中 查看更多[3]
吉林省名校联盟2023-2024学年高一下学期期中联合质量检测数学试题内蒙古自治区兴安盟2023-2024学年高二下学期学业水平质量检测数学试题(已下线)第9题 解三角形在几何图形中的应用(高一期末每日一题)
更新时间:2024-06-18 16:10:12
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【推荐1】如图,在
中,
,点
为边
的中点,
.
(1)求
;
(2)求
的面积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8879b4ae7b07927105c922c939843e4d.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/8faedb1dcf2637dbf0be0a9d40f09384.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/be61f49b-0e7d-4b3c-b1fb-3e8eec1d298b.png?resizew=153)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdddaf04139a84bb1f64fc9baa414497.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐2】如图,在平面四边形
中,
的面积为
,点
在以
为直径的圆上,点
在以
为直径的圆内,且满足
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/5/2435072308740096/2435826306146304/STEM/4e2a238f11b847cd86564eb76dbc72fb.png?resizew=133)
(1)求
;
(2)求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://img.xkw.com/dksih/QBM/2020/4/5/2435072308740096/2435826306146304/STEM/4e2a238f11b847cd86564eb76dbc72fb.png?resizew=133)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8baab87aaa703b3fe340e8fad36d4426.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】在△ABC中,角A、B、C的对边分别为
、
、
.已知向量
,
,且
.
(1)求
的值;
(2)若
,求△ABC的面积S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a94f5f3c3f02a22abe18c2010d155e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a454b8465b7d803f2c5d4b11c8e5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a90f98bccbc52762348a55d007b851f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291ba8755981dfc475aba139af8629da.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf29344537108b7c91586afc0fe9d3ec.png)
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【推荐2】在
中,角
所对的边分别为
,且
.
(1)求角
的大小;
(2)若
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f58ee901b9b2fcb8477ef79df5c404.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
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【推荐1】在
中,设角A,B,C所对的边分别为a,b,c.已知
,
的周长为15,面积为
.
(1)求
的外接圆面积;
(2)设D是边AB上一点,在①CD是边AB上的中线;②CD是
的角平分线这两个条件中任选一个,求线段CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d75a838ebbe4ecb373ab5b92222883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c00f7e3c9b3ca278015e3ec031f102.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)设D是边AB上一点,在①CD是边AB上的中线;②CD是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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【推荐2】某市规划一个平面示意图为如图的五边形ABCDE的一条自行车赛道,ED,DC,CB,BA,AE为赛道(不考虑宽度),BD,BE为赛道内的两条服务通道,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/d1a90dd5-e11a-46c7-9623-c43a74594be2.png?resizew=163)
(1)从以下两个条件中任选一个条件,求服务通道BE的长度;①
;②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cc18690815c775809f9a11d97f7a1b.png)
(2)在(1)条件下,应该如何设计,才能使折线段赛道BAE最长(即BA+AE最大)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c74df3c8d42af10c15c207200cfe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ab0e77c656955c6dad4b26cc9e5a48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/d1a90dd5-e11a-46c7-9623-c43a74594be2.png?resizew=163)
(1)从以下两个条件中任选一个条件,求服务通道BE的长度;①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24de16d7afb7fe2c553c645a109b7e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cc18690815c775809f9a11d97f7a1b.png)
(2)在(1)条件下,应该如何设计,才能使折线段赛道BAE最长(即BA+AE最大)
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【推荐1】2018年是中国改革开放40周年,改革开放40年来,从开启新时期到跨入新世纪,从站上新起点到进入新时代,我们党引领人民绘就了一幅波澜壮阔、气势恢宏的历史画卷,谱写了一曲感天动地、气壮山河的奋斗赞歌,40年来我们始终坚持保护环境和节约资源,坚持推进生态文明建设,郑州市政府也越来越重视生态系统的重建和维护,若市财政下拨一项专款100百万元,分别用于植绿护绿和处理污染两个生态维护项目,植绿护绿项目五年内带来的生态收益可表示为投放资金x(单位:百万元)的函数M(x(单位:百万元):
,处理污染项目五年内带来的生态收益可表示为投放资金x(单位:百万元)的函数N(x)(单位:百万元):
.
(Ⅰ)设分配给植绿护绿项目的资金为x(百万元),则两个生态项目五年内带来的收益总和为y,写出y关于x的函数解析式和定义域.
(Ⅱ)生态项目的投资开始利润薄弱,只有持之以恒,才能功在当代,利在千秋,试求出y的最大值,并求出此时对两个生态项目的投资分别为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b59e92a236c41839177274902e0dd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313efa51637b9bf322eb599ccca746c3.png)
(Ⅰ)设分配给植绿护绿项目的资金为x(百万元),则两个生态项目五年内带来的收益总和为y,写出y关于x的函数解析式和定义域.
(Ⅱ)生态项目的投资开始利润薄弱,只有持之以恒,才能功在当代,利在千秋,试求出y的最大值,并求出此时对两个生态项目的投资分别为多少?
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【推荐2】在
中,边
,
,
的对角分别为
,
,
,且满足
.
(1)求角
的大小;
(2)若
,求
面积的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df42da6c6c91cd72c42e802a275a977.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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