如图,学校升旗仪式上,主持人站在主席台前沿D处,测得旗杆AB顶部的仰角为
俯角最后一排学生C的俯角为
最后一排学生C测得旗杆顶部的仰角为
旗杆底部与学生在一个水平面上,并且不计学生身高.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/de8beb3a-7839-4735-8590-be755dcb75ce.png?resizew=226)
(1)设
米,试用
和
表示旗杆的高度AB(米);
(2)测得
米,
若国歌长度约为50秒,国旗班升旗手应以多大的速度匀速升旗才能是国旗到达旗杆顶点时师生的目光刚好停留在B处?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2813b1870eb5c43664820f461a75b402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a068881103abeb911514aa70eb9fd63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4bcc25eeae3c6cdc53dcbfd582e6ed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/de8beb3a-7839-4735-8590-be755dcb75ce.png?resizew=226)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4a7d7c2253a1686c61f8b8f3f6c6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da837806c2ff041e56b9bacd3ef41eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)测得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc559477c207a97b2cc5a631b52825e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb59eec07644cb38f9550751442c026.png)
18-19高一下·上海普陀·期中 查看更多[5]
上海市曹杨二中2018-2019学年高一下学期期中数学试题(已下线)第5讲+解三角形(练习)-【教育机构专用】2021年春季高一数学辅导讲义(沪教版2020必修第二册)上海市嘉定一中2020-2021学年高一下学期3月月考数学试题(已下线)上海期末真题精选50题(大题压轴版)-2020-2021学年高一数学下册期中期末考试高分直通车(沪教版2020必修第二册)广东省东莞市新世纪英才学校2020-2021学年高一下学期4月月考数学试题
更新时间:2019-11-08 10:50:37
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解题方法
【推荐1】如图,甲、乙两个企业的用电负荷量
关于投产持续时间
(单位:小时)的关系
均近似地满足函数
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/c7a66083-5d62-4d81-9b78-3a7fc14c543e.png?resizew=277)
(1)根据图象,求函数
的解析式;
(2)为使任意时刻两企业用电负荷量之和不超过9,现采用错峰用电的方式,让企业乙比企业甲推迟
小时投产,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9b65c51e37f40211b876be02105701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3140df7d3792c51dc1c728f0cd17a25.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/c7a66083-5d62-4d81-9b78-3a7fc14c543e.png?resizew=277)
(1)根据图象,求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c8ca569e742d9eeee3b85f61bd8e17.png)
(2)为使任意时刻两企业用电负荷量之和不超过9,现采用错峰用电的方式,让企业乙比企业甲推迟
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f07948e9258b482a2164ac871f90f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图,一个水轮的半径为4米,水轮圆心
距离水面2米,已知水轮每分钟逆时针转动4圈,如果当水轮上点
从水中浮现(图中点
)开始计算时间.
(1)将点
距离水面的高度
(米)表示为时间
(秒)的函数;
(2)在水轮旋转一圈内,有多长时间点
离开水面?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd412dcceb86240c64f1c4f02c0bb13.png)
(1)将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)在水轮旋转一圈内,有多长时间点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/f388f760-68bf-4a67-8a44-e675821a443f.png?resizew=160)
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【推荐3】已知
是沿海东西走向的全长
千米的高速公路,小岛
位于
的正北方,且距离
千米.赴
旅行的游客从
点出发坐旅游大巴至
点后换成快艇至岛
.已知旅游大巴的平均速度为
千米每小时,快艇的平均速度为
千米每小时,换乘点
设在从
至
用时最少处.
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639388061376512/2639423612985344/STEM/bb4d0d41-a934-4943-b5f3-52015e33996f.png?resizew=226)
(1)求
、
间的距离(用
表示)
(2)每日上午
时起,每隔
小时有一辆旅游大巴发车至
点,即发快艇且忽略换乘时间.若某日
时,有一风圈半径为
千米的七级台风,其中心位于
点正北
千米的洋面
点,并以上
千米每小时的速度垂直斜面
移动.为使快艇不至于进入台风风圈,若该日只发了
趟车,求
的距离
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b250e19d33392c9022b7417ae7e2467d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dae3db3ed7c7ec12b0c302a998e2d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639388061376512/2639423612985344/STEM/bb4d0d41-a934-4943-b5f3-52015e33996f.png?resizew=226)
(1)求
![](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/0c88d9142df6ba8e43c1a93bd04a1362.png)
(2)每日上午
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142d7ec5361df5853533602b2be11460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8e8298556654fd566ea3832f9f0c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94739218003e95c2c8149789cece756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】周口市广播电视塔位于周口市区七一路和周口大道交叉口处,该塔有效地解决了周口市广播电视无线信号覆盖范围小、信号质量差的问题.发射塔由塔座、塔身、井道、塔楼和天线等
个主要部分组成(如图1所示),其中天线为传统的四边形空间桁架结构,横截面层层缩进,在外形上有着芝麻开花节节高的吉祥寓意.国庆假期,章阳同学在取得有关部门许可的前提下,利用无人机对广播电视塔进行拍照与摄像.章阳同学在地面点
处测得塔楼
的仰角为
,无人机在
处沿仰角为
的方向飞行
米后到达
处,测得
,且
,
,
,
,
五个点都在同一平面内(如图2所示).
![](https://img.xkw.com/dksih/QBM/2021/11/23/2857692062326784/2858053833318400/STEM/e903456d9f8a45e48f6930dc665e1ca6.png?resizew=554)
(1)求塔楼到地面的高度
;
(2)如果广播电视塔的天线
的长是
米,无人机从
到
的飞行过程中,在点
处观看天线
的视角为
(即
),为了拍摄到天线
最为清晰的图像,要求视角
最大.若点
处距离地面的高度
为
米,那么
为何值时,无人机拍摄到天线
的图像最清晰?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.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/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf15952853fb42e8fd9a726598f67ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3ecac7aca747ed5e6ef84d907869e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f2665526efab6fdd59a4fe1bfe4e39.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/11/23/2857692062326784/2858053833318400/STEM/e903456d9f8a45e48f6930dc665e1ca6.png?resizew=554)
(1)求塔楼到地面的高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如果广播电视塔的天线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b765e032d24c1557ff29cb6f70be0a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26689ae5eba9a29775b20d7a2dcd3ace.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解题方法
【推荐2】如图,某人身高
,他站的地点
和云南大理文笔塔塔底
在同水平线上,他直立时,测得塔顶
的仰角
(点
在线段
上,忽略眼睛到头顶之间的距离,下同).他沿线段
向塔前进
到达点
,在点
直立时,测得塔顶
的仰角
:塔尖MN的视角
(
是塔尖底,在线段
上).
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754872852873216/2781076809252864/STEM/98bd4bdc-fae1-4c25-b0a0-b847bfac9913.png?resizew=331)
(1)求塔高
;
(2)此人在线段
上离点
多远时,他直立看塔尖
的视角最大?说明理由.
参考数据:
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad35c8e3dc9a0a2d7e17f235593a725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a2dfdcdab05b60a1ee81a74061e86d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98a867c15065700a04ccf6a3b9e6529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/bd8515118a6137f3323fa74730747559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79673bc5b6037d6516df1be25e0d2d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754872852873216/2781076809252864/STEM/98bd4bdc-fae1-4c25-b0a0-b847bfac9913.png?resizew=331)
(1)求塔高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
(2)此人在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21c6c8df2c8aaf99721ada68fe59cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892c71122fab5d95df9db7a94ca62d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39631c8b0f107dce57c8edc2ab0d8fd3.png)
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