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
名校
3 . 已知函数
,给出以下说法:
①当
有三个零点时,
的取值范围为
;
②
是偶函数;
③设
的极大值为
,极小值为
,若
,则
;
④若过点
可以作
图象的三条切线,则
的取值范围为
.
其中所有正确说法的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e274d6bb0f7e618dcec88bb2791cdcf.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4208889a65489ead5fc22fae3ca26dd9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649ae1af4ab147dd31a773141cdd47d1.png)
③设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee99ca13d8b9948a264d82838b1c436d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
④若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c9708ef0dc6d6f5dcf6596d3e4f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c47bcfe2d1bd9af0b9d80cb1ca9e0b.png)
其中所有正确说法的序号为
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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2022届高三下学期第一次模拟数学(理)试题变式题16-20
(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)
名校
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)
21-22高二·全国·单元测试
6 . (1)如图是一容量为100的样本的重量的频率分布直方图,则由图可估计样本重量的中位数为12.5;
(2)在回归分析中,代表了数据点和它在回归直线上相应位置的差异的是残差平方和;
(3)如果根据性别与是否爱好运动的列联表得到
,所以判断性别与运动有关,那么这种判断犯错的可能性不超过
;
(4)设有一个回归方程为
,则变量
增加一个单位时
平均减少5个单位;
(5)两个变量
与
的回归模型中分别选择了4个不同模型,它们的相关指数
如下,模型1的相关指数
为0.98,模型2的相关指数
为0.80,模型3的相关指数
为0.50,模型4的相关指数
为0.25.其中拟合效果最好的模型是模型4.其中正确命题的序号为__ .
(2)在回归分析中,代表了数据点和它在回归直线上相应位置的差异的是残差平方和;
(3)如果根据性别与是否爱好运动的列联表得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85cea61dd2c8f4841e7ea4688eab8e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad2925d2ce0e1e8ef352f9501f2590d.png)
![]() | 0.100 | 0.050 | 0.010 |
![]() | 2.706 | 3.841 | 6.635 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4679a465811a2379ac7e3bf75877874f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(5)两个变量
![](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/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/14d48308-5cf3-47da-bb0b-9bfcbafe6314.png?resizew=144)
您最近一年使用:0次
23-24高二下·全国·课前预习
解题方法
7 . 判断正误,正确的写正确,错误的写错误.
(1)等差数列前
项和公式的推导方法是倒序相加.( )
(2)若数列
的前
项和
,则
为常数列.( )
(3)等差数列的前
项和,等于其首项、第
项的等差中项的
倍.( )
(4)
.( )
(1)等差数列前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8271bf23009e445137406321047a142b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)等差数列的前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0365855d9f439487911ff2391fb1ff70.png)
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21-22高二·全国·课后作业
8 . 下列关于等高堆积条形图的叙述正确的是( )
A.从等高堆积条形图中可以精确地判断两个分类变量是否有关系
B.从等高堆积条形图中可以看出两个变量频数的相对大小
C.从等高堆积条形图中可以粗略地看出两个分类变量是否有关系
D.以上说法都不对
A.从等高堆积条形图中可以精确地判断两个分类变量是否有关系
B.从等高堆积条形图中可以看出两个变量频数的相对大小
C.从等高堆积条形图中可以粗略地看出两个分类变量是否有关系
D.以上说法都不对
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9 . 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)
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![](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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18986bb85782ebb42ce85629b4ea8d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb037e045b5418574fe43786d011b870.png)
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10 . 判断正误(正确的写正确,错误的写错误)
(1)数列
和数列
是同一个数列.( )
(2)数列中的每一项都与它的序号有关.( )
(3)
与
是不同的概念.( )
(4)有些数列没有通项公式.( )
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66265fdf44defb54192cecb9349a26b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a498a5503156a4485b95c0da967e66.png)
(2)数列中的每一项都与它的序号有关.
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e38321617930485aed7b188a22f464.png)
(4)有些数列没有通项公式.
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