1 . 已知数列
,则它的第8项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2564ee88b0c3a87482223c317417f0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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江西省九江市武宁县尚美中学2023-2024学年高二下学期4月期中数学试题河南省名校联考2023-2024学年高二下学期4月月考数学试题(已下线)模块五 专题2 全真基础模拟2(人教B版高二期中)(已下线)北师大版本模块五 专题3 全真能力模拟3(高二期中)(已下线)模块一专题2《数列的通项公式与求和》单元检测篇A基础卷(高二人教B版)(已下线)模块一 专题3《数列的通项公式与求和》单元检测篇A基础卷(高二北师大版)
2 . 在数列
中,
,则其前45项的和为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c168aedc4df80e1f9d8dc236718d84.png)
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解题方法
3 . 环境监测部门为调研汽车流量对空气质量的影响,在某监测点统计每日过往的汽车流量
(单位:辆)和空气中的PM2.5的平均浓度
(单位:
).调研人员采集了50天的数据,制作了关于
的散点图,并用直线
与
将散点图分成如图所示的四个区域I,II,III,IV,落入对应区域的样本点的个数依次为
.
列联表,并判断至少有多大把握认为“PM2.5平均浓度不小于
”与“汽车日流量不小于1500辆”有关;
(2)经计算得到回归方程为
,且这50天的汽车日流量
的标准差
252,PM2.5的平均浓度
的标准差
,求相关系数
,并判断该回归方程是否有价值.
参考公式:
,其中
.
回归方程
,其中
.
相关系数
.若
,则认为
与
有较强的线性相关性.
![](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/5c96b3b9db5d21d4655a7676d7839f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2454ba8bee2d167e763311513bed4d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9650d3fc27b93984881ca59e64d7cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd63ebbdb834dd3028f1bdb3cb948d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bccb5b2c1ec2fbad01c5da8428c30ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cff1dc78c7ef95bb9b7cbcca7b63c77.png)
汽车日流量![]() | 汽车日流量![]() | 合计 | |
PM2.5的平均浓度![]() | |||
PM2.5的平均浓度![]() | |||
合计 |
(2)经计算得到回归方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91030ffaa2e55e6d4d206a1910c6dca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98c1cd90aa5674624bc908a74db5713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cd110b9775ee011aeadea99f4d95da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481998e1e8504ffff178f656be3c068e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![]() | 0.100 | 0.050 | 0.010 | 0.001 |
![]() | 2.706 | 3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf74bbdee085c44778ac6191e5016b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262a75ae81c34cde2ee5ce0285a88b16.png)
相关系数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc876ca59077fc244f6ad01a0cec461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a9721dfd7f61a47a7064feaa8ebbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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名校
4 . 已知等差数列
的前
项和为
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c18794c3aeb5f15c763402f1c93db48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
A.35 | B.30 | C.20 | D.15 |
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5 . 在等比数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa37e5661af68b263a3ed9030d4e9003.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d67e86cdc041f4273203883a0d7eec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa37e5661af68b263a3ed9030d4e9003.png)
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名校
解题方法
6 . 伯努利不等式又称贝努力不等式,由著名数学家伯努利发现并提出.伯努利不等式在证明数列极限、函数的单调性以及在其他不等式的证明等方面都有着极其广泛的应用.伯努利不等式的一种常见形式为:当
时,
,当且仅当
或
时取等号.
(1)假设某地区现有人口
万,且人口的年平均增长率为
,以此增长率为依据,试判断
年后该地区人口的估计值是否能超过
万?
(2)数学上常用
表示
,
,
,
的乘积,
.
①证明:
;
②数列
,
满足:
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb9a7b379a1c221a80a57ae335f5c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7aa7d0c68906937a6392606de445d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(1)假设某地区现有人口
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ba01d85cd57bded85cf3302538084bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18ea011a4bce91e9f27c828b05b34eb.png)
(2)数学上常用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca374b4e6d3ebc183c5b21d4ea7220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a841d8525dad99ea07cc0f7eeb96aaa.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e548f475d3b31274ea78bc7e06013da.png)
②数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80c1ed7b10ac7ca1cd81cdd39a8fcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2f1c445c8f1f9ab8055017beb6fdf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7395787456de0be7174732f0d2939cf0.png)
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7 . 设直线
,一束光线从原点
出发沿射线
向直线
射出,经
反射后与
轴交于点
,再次经
轴反射后与
轴交于点
.若
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aefcbc03a5c916ebb20f891a0fe7e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2c243b228f84a2692cbfb94d56dead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caccbdd38667f6e1728672eff243c0dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解题方法
8 . 已知点
,
是圆
:
上的任意一点,线段
的垂直平分线交
于点
,设动点
的轨迹曲线为
;
(1)求曲线
的方程;
(2)过点
作斜率不为0的直线
交曲线
于
两点,交直线
于
.过点
作
轴的垂线,垂足为
,直线
交
轴于
点,直线
交
轴于
点,求线段
中点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daec826bcf98e738a52fa34eb8a5e85b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8607b7bdbcb604e6fcfbccb66ed2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09fcb20a6972108871adbf284f9e5006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ffda0c209f06e21770aeab0abc8cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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9 . 已知数列
是等差数列,数列
是等比数列,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfdc8acf10df50e81016e9b913df076.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7cac66841c020317096ee50b1f0d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aedc16dd3b7d0ab0ee68bde2337a9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfdc8acf10df50e81016e9b913df076.png)
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10 . 有编号分别为1,2,3,4的4张电影票,要分给甲、乙、丙3个人,每人至少分得一张,且4张电影票全部分完,则不同分配方法的种数为( )
A.24 | B.36 | C.64 | D.72 |
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江西省九江市第一中学2023-2024学年高二下学期4月月考数学试题重庆市黔江中学校2023-2024学年高二下学期3月月考数学试题(已下线)6.2.3&6.2.4 组合、组合数(8大题型)精讲-2023-2024学年高二数学题型分类归纳讲与练(人教A版2019选择性必修第三册)