1 . 下表中所列的是某地区一年中十天的白昼时间.表中日期为(月、日)
某同学以日期为
轴(天),以白昼时长为
轴(小时),建立直角坐标系,绘出了散点图(如图),他想用余弦曲线去拟合这些数据,经过查找资料,他建立了模型
,则
( )
日期 | 1月1日 | 2月28日 | 3月21日 | 4月27日 | 5月6日 | 6月21日 | 8月14日 | 9月23日 | 10月25日 | 11月21日 |
小时 | 5.59 | 10.23 | 12.38 | 15.91 | 16.71 | 19.40 | 15.93 | 12.61 | 9.14 | 5.44 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42401422a5bc0b6d2d2af0770cf7c460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.5 | B.6 | C.7 | D.8 |
您最近一年使用:0次
2 . 定义两个向量
之间的运算“
”为
.其中
,
,若向量
,则向量
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091e86ca89e484b331fd90125a5e5af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d845b425d73c24b6ba88ea5447ab03a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c857eec21dd64ccf0ba530883bb6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcab0226effeccd2a336c23079bc1be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf28ca5acd5f256d78677041aeec9776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c5186ca272d0cbf0ee500e4a1dce008.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 正实数
成等差数列,对
,
,已知方程
有两个相等的实根,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636995f2a3d0002f8770cf3c4b6fb466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209559aca6bf32705588b6a40e0b7320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0d90384477629ddc37da42903d72eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4dea25a60975362c07560fecbd21a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f9f27d26082d9c8f3f845e9aa87997.png)
您最近一年使用:0次
解题方法
4 . 如图,三个机器人
和检测台
位于同一直线上,三个机器人需把各自生产的零件送到
处进行检测,送检程序规定:当
把零件送到
处时,
立刻自动出发送检,当
把零件送到
处时,
立刻自动出发送检,设
的送检速度为
,且送检速度是
的2倍,
的3倍.
把各自生产的零件送到检测台
处的时间总和;
(2)现要求
送检时间总和必须最短,请你找出检测台
在该直线上的位置(
与
均不重合).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75193c2de6968a93cf0bffc2f77f807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e05f91d7c92d26dc2ed37c4b4f6369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)现要求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e05f91d7c92d26dc2ed37c4b4f6369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e05f91d7c92d26dc2ed37c4b4f6369.png)
您最近一年使用:0次
5 . 设定义域、值域均为
的函数
的反函数为
,且
,则
的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135bcf6d7f7c04641823b90f1d038eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39aaae228ee5433a30a92b382d5b924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4207c0c380fe06d3dcc360cb18647f.png)
A.2 | B.0 | C.![]() | D.![]() |
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解题方法
6 . 已知
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1502ac2d59417473fd2f0b7e0b99297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c01c10f061ba6af45d42b2d196f6bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad49204866db0d15bf0b22f3cfea021b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f14e91b0d4d7894d03b81b71faab69.png)
您最近一年使用:0次
解题方法
7 . 对于函数
,设
,令
,则集合
中的元素个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ba1886f41502e5aebf281cdfe7e8bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2966b2b7c1fbbf73d79989b52cb8c8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cdeb0646428f25bb96abaf4c3451a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
A.0个 | B.1个 | C.2个 | D.3个 |
您最近一年使用:0次
8 . 已知函数
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61228bf9a9e5bfa26e7e3eaeb48cf909.png)
.
(1)若函数
的图象过点
、
,求函数
的解析式;
(2)如图,点M、N是函数
的图象在
轴两侧与
轴的两个相邻交点,函数图象上一点
满足
,求函数
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064b3e9a9a7551f282b530877228cb8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61228bf9a9e5bfa26e7e3eaeb48cf909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61df454f1485f9d448402586945b868.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023c93917c96d00ea4ba399fa441a685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b97fc3360cdfc250e7eb1bf24bcb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)如图,点M、N是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efe6112e30f859a68339fb6793bded8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6aa5d475a3da2ee13c1a407bc6e0b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
您最近一年使用:0次
解题方法
9 . 如图所示,已知直角梯形
中,
,
;设
(其中
),
为线段
的中点.
时,若
三点共线,求
的值;
(2)若
的面积为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af29fec330be3a065d1d7adc4fc0270d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d46c43ef6f4aa234484bfb06fb9b5b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154d7056303cb5f086b8765bd7dd6711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a466cb70db91e0ee70ab31036c8a2f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8493a0cd10d3d0399173c04163740a38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068501f967ad91a24bf1079c432d0599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1936867fb8d9588f0e99c8865318877.png)
您最近一年使用:0次
10 . 已知集合
,且
,给出下列命题:
①满足
的集合
的个数为
;
②满足
⫋
的集合
的个数为
;
③满足
⫋
的集合
的个数为
;
④满足
⫋
⫋
的集合
的个数为
.
其中正确的是______ .(填上你认为正确的所有命题序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab20b8212340e97321f421a74de3af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eae51f0310b87cde2e206643e9d25a5.png)
①满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24b70c88f46920bc6c3b0ed8d900f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa3ccc967a75d0739e71f8df80b5b76.png)
②满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366749e18358402f70feb02785251caf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89ae078ee147741e42b344b3d20776b.png)
③满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22882310035db6d3d953e060b0c91733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3e84efcba619b04bc1a89e68f1c507.png)
④满足
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67e9f11658eb229c3f75eb3ff71ac23.png)
其中正确的是
您最近一年使用:0次