解题方法
1 . 为提升学生用数学知识解决现实生活或其他学科领域中的问题的能力,发展学生数学建模素养,某市面向全市高中学生开展数学建模论文征文活动.对于参加征文活动的每篇论文,由两位评委独立评分,取两位评委评分的平均数作为该篇论文的初评得分.从评委甲和评委乙负责评审的论文中随机抽取10篇,这10篇论文的评分情况如下表所示.
(1)从这
篇论文中随机抽取1篇,求甲、乙两位评委的评分之差的绝对值不超过
的概率;
(2)从这
篇论文中随机抽取3篇,甲、乙两位评委对同一篇论文的评分之差的绝对值不超过
的篇数记为
,求
的分布列及数学期望;
(3)对于序号为
的论文,设评委甲的评分为
,评委乙的评分为
,分别记甲、乙两位评委对这10篇论文评分的平均数为
,
,标准差为
,
,以
作为序号为
的论文的标准化得分.对这10篇论文按照初评得分与标准化得分分别从高到低进行排名,判断序号为2的论文的两种排名结果是否相同?(结论不要求证明)
序号 | 评委甲评分 | 评委乙评分 | 初评得分 |
1 | 67 | 82 | 74.5 |
2 | 80 | 86 | 83 |
3 | 61 | 76 | 68.5 |
4 | 78 | 84 | 81 |
5 | 70 | 85 | 77.5 |
6 | 81 | 83 | 82 |
7 | 84 | 86 | 85 |
8 | 68 | 74 | 71 |
9 | 66 | 77 | 71.5 |
10 | 64 | 82 | 73 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
(2)从这
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(3)对于序号为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2968ea9d16fcf1181908c9790c423336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f95e54a9b7c66c97dc6ee6161a25c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc00379c7af113543302417b685c7d6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80746e5e22851a0f1075374a3c3280ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7a1a659607d4d81c81f4f6545df241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02526771dc5a6d66fb9029bff5eac3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4bf6d5a546594c4176867be0ec896b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356a0eecfd01ef9b7fec91cf600603ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
您最近一年使用:0次
2 . 已知圆
的方程为:
,点
,
,
是线段
上的动点,过
作圆
的切线,切点分别为
,
,现有以下四种说法:①四边形
的面积的最小值为1;②四边形
的面积的最大值为
;③
的最小值为
;④
的最大值为
.其中所有正确说法的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29610a3415c1e795d35979a5a9ff69f3.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/bc693a05f1f73d6d71667016e7d6094c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc693a05f1f73d6d71667016e7d6094c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f268856e2fcb059176a98b5ae1a38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f268856e2fcb059176a98b5ae1a38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
A.①③④ | B.①②④ | C.②③④ | D.①④ |
您最近一年使用:0次
3 . “曼哈顿距离”是人脸识别中一种重要的测距方式.其定义如下:
设
是坐标平面内的两点,则A,B两点间的曼哈顿距离为
.
在平面直角坐标系中
中,下列说法中正确说法的序号为__________
①.若
,则
;
②.若O为坐标原点,且动点P满足:
,则P的轨迹长度为
;
③.设
是坐标平面内的定点,动点N满足:
,则N的轨迹是以点
为顶点的正方形;
④.设
,则动点
构成的平面区域的面积为10.
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093c6d5bcaa69cea79b24688f5d1bd97.png)
在平面直角坐标系中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
①.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ccf6769201c55ae5ae826d00f8bcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab82a9c913753411e77ca39282192441.png)
②.若O为坐标原点,且动点P满足:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323425fb46a89bf5305ee1c2d700de5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
③.设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed7b255e6a8bb6fd15cc744d35786b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bcedf33c8b82facbef6cd87a2d3a88.png)
④.设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5292a8e4c2c929876c42c9cfabf1244f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
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4 . 已知函数
,
,
恰有
个零点
、
、
,且
,有下列结论:
①
;
②
;
③
;
④
.
其中正确结论的序号为______ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8467c9cc9e33d79353824c92295006c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9aa676fad54f444d64c488445c05c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1310a7a80d1f8751a3f8cafe7f8c8b4.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9440f2d7ae0b2039fd68e50aec92d55f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559566a2c371f26140a968ba4675f1ce.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b50babdf93967de25ebcf5f09d55381.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053bbe2262e60c7729b13fbd77729f44.png)
其中正确结论的序号为
您最近一年使用:0次
2022-03-07更新
|
657次组卷
|
3卷引用:三省三校(黑龙江哈师大附中、东北师大附中、辽宁实验中学)2022届高三下学期第一次模拟数学(理)试题
三省三校(黑龙江哈师大附中、东北师大附中、辽宁实验中学)2022届高三下学期第一次模拟数学(理)试题福建省南平市浦城县第三中学2023届高三上学期数学期中测试模拟卷试题(3)(已下线)三省三校2022届高三下学期第一次模拟数学(理)试题变式题16-20
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5 . 如图为国家统计局
年
月
日发布的
年各季度社会消费品零售总额及增速,则下列说法:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/a0ad2900-e809-4743-9e67-ef94a0b7c7fd.png?resizew=367)
①各季度社会消费品零售总额增速最快的是
季度;
②各季度社会消费品零售总额增速最快的是
季度;
③各季度社会消费品零售总额增量最大的是
季度;
④各季度社会消费品零售总额增量最大的是
季度.
其中所有正确说法的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151e5633a5d0cc30b254167e3dda5803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be7581dbbccda50e5d5cd18056ddea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701554763bdbbf2689a8dae07608da38.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/a0ad2900-e809-4743-9e67-ef94a0b7c7fd.png?resizew=367)
①各季度社会消费品零售总额增速最快的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
②各季度社会消费品零售总额增速最快的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
③各季度社会消费品零售总额增量最大的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
④各季度社会消费品零售总额增量最大的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
其中所有正确说法的序号为( )
A.①④ | B.②③ | C.①③ | D.②④ |
您最近一年使用:0次
2021-07-04更新
|
230次组卷
|
3卷引用:全国2021届高三高考数学(文)演练试卷(一)
6 . 考查等式:
(*),其中
,
且
.某同学用概率论方法证明等式(*)如下:设一批产品共有
件,其中
件是次品,其余为正品.现从中随机取出
件产品,记事件
{取到的
件产品中恰有
件次品},则
,
,1,2,…,
.显然
,
,…,
为互斥事件,且
(必然事件),因此
,所以
,即等式(*)成立.对此,有的同学认为上述证明是正确的,体现了偶然性与必然性的统一;但有的同学对上述证明方法的科学性与严谨性提出质疑.现有以下四个判断:①等式(*)成立,②等式(*)不成立,③证明正确,④证明不正确,试写出所有正确判断的序号___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb037e045b5418574fe43786d011b870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a0d69abd7440e8c12a1cc1473a97a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0158fa1faefc97c5f71d29afec59d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/845198f8baea2e38597b647c25c9f80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b89f303306dc40a27c37c63b2564c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a724f29764aa9f60eae054bc085cd3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882037b9ce104ecc496e0f31a139361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7356ec98b600ece41f3a6b4bc26a7d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd55ae46a41a37f90a3d745b9e8f879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de035ed078636b813bf458049b0c9f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18986bb85782ebb42ce85629b4ea8d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb037e045b5418574fe43786d011b870.png)
您最近一年使用:0次
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7 . 设正数
不全相等,
,函数
.关于说法
①对任意
都为偶函数,
②对任意
在
上严格单调递增,
以下判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d74781f2fcb2c572de65c4f702d5457.png)
①对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75c03244f2565ccad815ed9305655b4.png)
②对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75c03244f2565ccad815ed9305655b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d720165be8b61db4a8b305ad47c7f2a0.png)
以下判断正确的是( )
A.①、②都正确 | B.①正确、②错误 | C.①错误、②正确 | D.①、②都错误 |
您最近一年使用:0次
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8 . 以下命题错误的序号为( )
①
与
是两条不同的直线,则“
”是“
”的充分不必要条件;
②若“
”是真命题,则“
”一定是假命题;
③荀子曰:不积跬步,无以至千里,不积小流,无以成江海.这说明“积跬步”是“至千里”的充分条件;
④“
”是“
为奇函数”的充要条件.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ffcf966fb0d99555aa3862f933ba14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37c9888b01053e656d567cc2c1dc759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e03566282ef39ad17821036f228174.png)
②若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e48ebdd742cb5d310c21a384d599bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6777065ed14d76944be5cb45d9e2c76.png)
③荀子曰:不积跬步,无以至千里,不积小流,无以成江海.这说明“积跬步”是“至千里”的充分条件;
④“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104375baf5cef5eb92cfc7cf13b80193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
A.①③④ | B.①② | C.③④ | D.①④ |
您最近一年使用:0次
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解题方法
9 . 设函数
的定义域为
,给出下列命题:
①若对任意
,均有
,则
一定不是奇函数;
②若对任意
,均有
,则
为奇函数或偶函数;
③若对任意
,均有
,则
必为偶函数;
④若对任意
,均有
,且
为
上增函数,则
必为奇函数;
其中为真命题的序号为__ (请写出所有真命题的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
①若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb06544da76ec02c74d2adb0a115d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
②若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c76849db86d931f64f9e6e65ebce9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/465476d4a842d56606427d597a1abbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
④若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c76849db86d931f64f9e6e65ebce9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
其中为真命题的序号为
您最近一年使用:0次
10 . 阅读以下材料,判断下列命题的真假
在复数域内,大小成为了没有意义的量,那么我们能否赋予它一个定义呢.在实数域内,我们通常用绝对值来描述大小,而复数域中也相应的有复数的模长来代替绝对值,于是,我们只需定义复数的正负即可.我们规定复数的“长度”即为模长,规定在复平面x轴上方的复数为正,在x轴下方的复数为负,在x轴上的复数即为实数大小.“大小”用符号+“长度”表示,我们用[z]来表示这个复数的“大小”
例如
,
,
,
.
①在复平面上的复数的大小一定大于在它正下方的复数大小;
②在复平面内做一条直线
,
对应的点在该直线上,则
的最小值为
;
③复数
;
④
在复平面上表现为一个半圆;
⑤无法在复平面上找到满足方程
的点.
其中,正确的序号为__________
在复数域内,大小成为了没有意义的量,那么我们能否赋予它一个定义呢.在实数域内,我们通常用绝对值来描述大小,而复数域中也相应的有复数的模长来代替绝对值,于是,我们只需定义复数的正负即可.我们规定复数的“长度”即为模长,规定在复平面x轴上方的复数为正,在x轴下方的复数为负,在x轴上的复数即为实数大小.“大小”用符号+“长度”表示,我们用[z]来表示这个复数的“大小”
例如
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1a4212ab8791873d6d0ddbfc88265c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eb682e1e712218094425e49f4eab6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf2cb29f6f6700c6dc1683de1b2cbed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ab778d8ce4074ed517a7b0df099283.png)
①在复平面上的复数的大小一定大于在它正下方的复数大小;
②在复平面内做一条直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b8e7c0a6f877ef89d6e9a78f1dcbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
③复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ff25025839c012b7136df2f3e8254ca.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0da924b9e57c11a99e550a9d9b05cd0.png)
⑤无法在复平面上找到满足方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c36a4e9b7a22c1bc159f2ed1b53b1e2.png)
其中,正确的序号为
您最近一年使用:0次