名校
1 . 已知
的内角A,B,C的对边分别为a,b,c,
,
,点D,P为平面内两动点,
,点N是BC的中点,DN与AC相交于点M(点M异于点A,C),点O为
内切圆圆心,且
.
(1)求角A和
的值;
(2)设
,
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8022aa15203e82af68605eb626a28c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240035192d4c2c6416fa0af71020629c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/440eb5373b06e0e24b83c762bf79a649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579ba4acf11bdca32cb9c73de15cb646.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/abe01b6a-b8ca-4f22-a540-e3e18a5dc7ee.png?resizew=167)
(1)求角A和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c6b94e3aec412c946821e781228d8e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64338b589bee79c8076196856b225a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459623a999498eb74270d92ce2d845d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3466b71d1d9117438ed50388a57d9397.png)
您最近一年使用:0次
2023-07-14更新
|
151次组卷
|
2卷引用:湖南省株洲市第二中学2021-2022学年高一下学期第三次月考数学试卷
名校
解题方法
2 . 某旅游景区内有一块等边三角形的景点
,其中
.
(1)如图1,为迎接观光游,拟修建观赏小径
,
,其中
,
,
分别在
,
,
上,且
,问
是否为定值?说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/27a64c45-da0f-4527-909f-06eca9fc3297.png?resizew=184)
(2)如图2,为满足游客需求,拟修建两条商业街
和
,其中点
在
上,点
在
上.若
为
中点,且
,
,求
的最大值及此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb7e898b5a4ca765d469d68413b7bfe.png)
(1)如图1,为迎接观光游,拟修建观赏小径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d39478286e26a367bfe457f0f0ef68a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/27a64c45-da0f-4527-909f-06eca9fc3297.png?resizew=184)
(2)如图2,为满足游客需求,拟修建两条商业街
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7da595406d89ce8a442ee27a12eec9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c25dd1aa0e87fa261d0c30f9b9f1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21d14b632a1aaa29ac232715a3d28e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/303d602d-7a86-44c8-a92e-a5b32bf7f7f6.png?resizew=187)
您最近一年使用:0次
名校
解题方法
3 . 如图,某景区绿化规划中,有一块等腰直角三角形空地
,
,
,
为
上一点,满足
.现欲在边界
,
(不包括端点)上分别选取
,
两点,并在四边形
区域内种植花卉,且
,设
.
(1)证明:
;
(2)
为何值时,花卉种植的面积占整个空地面积的一半?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354c20e085fe1a99a8be03bd1d16b2f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ef1f4982526c6e714fa8c50fbf7e0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a3d7e3d361117f56c3f02c82687f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a0982460d2fdf7f28aabe7f8ae01e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d8f7b924d985f3c4af8cb913271ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c58605d04f34a2887781b049ca8f7c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/22/2ad8ac62-f98a-45df-a499-c17b02ba1dfe.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14091f3f56eb41a8be016478e932bed8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
您最近一年使用:0次
2023-06-18更新
|
366次组卷
|
3卷引用:广东省深圳外国语学校2023届高三上学期第一次月考(入学测试)数学试题
解题方法
4 . 如图所示,某市在海岛
上建了一水产养殖中心.在海岸线
上有相距70公里的
两个小镇,并且
公里,
公里,已知
镇在养殖中心工作的员工有3百人,
镇在养殖中心工作的员工有5百人.现欲在
之间建一个码头
,接送来自两镇的员工到养殖中心工作,又知水路运输与陆路运输每百人每公里运输成本之比为
.
(1)求
的大小;
(2)设
,试确定
的大小,使得运输总成本最少.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f325403cbedaac249c9a78d33da81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c5ff9c0671fb5f4afe00c5b7b1ed97.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/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/22/5d96e464-1fb7-4ca5-9d71-b32b20eba39a.png?resizew=140)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ffdb117605acb86699952e445db2aa.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613c7880436b3ba62b5c240bbdbea18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
5 . 如图是某所大学数学爱好者协会的会标,其内部是一个边长为
的正五边形,外面一圈是五个全等的四边形.其中
.则四边形
的周长为
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/a17973be-3ee8-4a3f-91db-b1cd88ff0f44.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76abd5c7675976b9d430547527f4d447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f956efa01e4275f461faedba8c43e6b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/a17973be-3ee8-4a3f-91db-b1cd88ff0f44.png?resizew=192)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 小军在校园内测对岸广电大厦楼顶无线塔
的高度,他在校园水平面上选取两点
,测得
,测得
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/c86724ac-939b-4110-9ce1-1a1c018af043.png?resizew=146)
(1)求
;
(2)求无线塔
的高度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a92c18b19fca1cbcb823433cf92aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ee2c2082e35f409e2a5280a7ed34c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817195c2e85e7c80c8bbbeb51d49ee8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5251588080e98c852791eb2c1ce4b158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02747066b0d5f43c2d3ff452fe102f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70beae0887d1e24d462103b7a1fab438.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/c86724ac-939b-4110-9ce1-1a1c018af043.png?resizew=146)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求无线塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
名校
解题方法
7 . 如图,某地计划在一海滩处建造一个养殖场,射线
为海岸线,
,现用长度为1千米的网依托海岸线围成一个
的养殖场
,求
的长度
(2)问如何选取点
,才能使得养殖场
的面积最大,并求其最大面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a5e484dfef494d27bc35ae7b8cf75d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a4c11d41372175ba3541a44c3376b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc762dc0fe9038201284106554f59cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead712767c9516eac92bbab34779eecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)问如何选取点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc762dc0fe9038201284106554f59cb0.png)
您最近一年使用:0次
2022-11-30更新
|
384次组卷
|
4卷引用:上海市西南位育中学2021-2022学年高二下学期期末数学试题
8 . 雷峰塔又名黄妃塔、西关砖塔,位于浙江省杭州市西湖区,地处西湖风景区南岸夕照山(海拔46米)之上.是吴越国王钱俶为供奉佛螺髻发舍利、祈求国泰民安而建.始建于北宋太平兴国二年(977年),历代屡加重修.现存建筑以原雷峰塔为原型设计,重建于2002年,是“西湖十景”之一,中国九大名塔之一,中国首座彩色铜雕宝塔.李华同学为测量塔高,在西湖边相距
的
、
两处(海拔均约16米)各放置一架垂直于地面高为
米的测角仪
、
(如图所示).在测角仪
处测得两个数据:塔顶
仰角
及塔顶
与观测仪
点的视角
在测角仪
处测得塔顶
与观测仪
点的视角
,李华根据以上数据能估计雷锋塔
的高度约为( )(参考数据:
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/835c6274-5c9a-45d4-b75f-ff0b5bf7a853.png?resizew=257)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05ba29eb90358e2211e1f7ba6423fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8f58755aee89fb2cf72ba518dcee2a.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e3dd0b09743b1578117dc50d337bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd6249a8572268299aae65f2f805e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbe62626fd595098138b47763797ca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b98736d884e646bcc0e71ceee5c7b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f01267b43f40f9be3b456903c7de62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/835c6274-5c9a-45d4-b75f-ff0b5bf7a853.png?resizew=257)
A.70.5 | B.71 | C.71.5 | D.72 |
您最近一年使用:0次
2022-11-26更新
|
1324次组卷
|
6卷引用:浙江省9+1高中联盟2022-2023学年高三上学期11月期中联考数学试题
浙江省9+1高中联盟2022-2023学年高三上学期11月期中联考数学试题(已下线)专题4-2 正余弦定理中的高频小题归类-2湖北省武汉市华中师范大学第一附属中学2023届高三下学期2月月考数学试题(已下线)江西省上饶市2023届高三第一次高考模拟考试数学(理)试题变式题6-10(已下线)江苏省八市2023届高三二模数学试题变式题1-5(已下线)6.4.3 余弦定理、 正弦定理 第3课时 余弦定理、正弦定理应用举例(分层作业)-【上好课】
名校
9 . 随着越来越多的家庭选择自驾到公园游玩,公园停车位严重不足.如图所示,公园里有一块扇形空地
,其半径为
,
,
为弧
的中点,要在其内接矩形
(点
、
分别在半径
、
上,点
、
在弧
上,且
)上修建停车场,则停车场面积最大值为(单位:
)( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/701c2a33-b092-496e-a92c-7b29cb4351f2.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c08094f72d5bd69246c453dd28e33d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-11-26更新
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800次组卷
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3卷引用:湖北省武汉市华中师范大学第一附属中学2022-2023学年高三上学期期中数学试题
湖北省武汉市华中师范大学第一附属中学2022-2023学年高三上学期期中数学试题湖南省张家界市慈利县第一中学2022-2023学年高三上学期第四次月考数学试题(已下线)第14讲 三角恒等变换、三角函数的应用(7大考点)-2022-2023学年高一数学考试满分全攻略(人教A版2019必修第一册)
10 . 10世纪阿拉伯天文学家阿尔库希设计出一种方案,通过两个观察者异地同时观测同一颗小天体来测定小天体的高度.如图,有两个观察者在地球上A,B两地同时观测到一颗卫星S,仰角分别为∠SAM和∠SBM(MA,MB表示当地的水平线,即为地球表面的切线),设地球半径为R,
的长度为
,∠SAM=30°,∠SBM=45°,则卫星S到地面的高度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268d034569bc3d98fef42901a335e1c9.png)
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5卷引用:江苏省连云港市2022-2023学年高三上学期期中数学试题