名校
1 . 已知
,且
成等差数列,随机变量
的分布列为
下列选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fed98a219097783e0ca2f41483cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | 1 | 2 | 3 |
![]() | ![]() | ![]() | ![]() |
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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7日内更新
|
192次组卷
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6卷引用:重庆市第四十九中学校、江津第二中学校等九校2023-2024学年高二下学期5月联考数学试题
名校
2 . 在等差数列
中,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605645034f708fd13ddddb872c4782a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f596d3e0ea522292d6b6fa8b3032fe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 已知
是各项均为正数的等差数列,其前
项和为
,满足
对任意的
成立.
(1)求
的通项公式;
(2)令
,记
为数列
的前
项和.证明:当
时,
.
![](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/6947966790678dcf4a1c6b9d30f556b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deda945164283569437cda6976fe35ea.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d896c0ac826b417ab338050de7c837db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45deada38f235bf0efb327bc4477034a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12993f88db04326b694efa635fc1ef33.png)
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4 . 已知等差数列
的公差为
,前
项和为
,则“
”是“
是递增数列”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/4f8e68eb4ade6e22982d2df5102d8894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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解题方法
5 . 数列
的前
项和为
,则
可以是( )
![](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/32c58093fdb69854da3cb129789def99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599e7f2f8baaa37baa05e1415b790bbb.png)
A.18 | B.12 | C.9 | D.6 |
您最近一年使用:0次
2024-06-12更新
|
1268次组卷
|
5卷引用:重庆市第一中学校2023-2024学年高二下学期5月月考数学试题
名校
6 . 设等差数列
的公差为
,前
项和为
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/b55a44fffe8ee4def3cee77a32476985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
A.![]() | B.![]() | C.1 | D.2 |
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7 . 已知一组数据
,
,
,
是公差不为0的等差数列,若去掉数据
,则( )
![](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/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcd5c11234a01e2b3d2861e9b3a3aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20c1e5866f81c045a596079ac4a7671.png)
A.中位数不变 | B.平均数不变 | C.方差变大 | D.方差变小 |
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2024-06-10更新
|
347次组卷
|
2卷引用:重庆市乌江新高考协作体2023-2024学年高二下学期第二阶段性学业质量联合调研抽测(5月)数学试题
8 . 冒泡排序是一种计算机科学领域的较简单的排序算法.其基本思想是:通过对待排序序列
从左往右,依次对相邻两个元素
(
,2,
,
)比较大小,若
,则交换两个数的位置,使值较大的元素逐渐从左移向右,就如水底下的气泡一样逐渐向上冒,重复以上过程直到序列中所有数都是按照从小到大排列为止.例如:对于序列
进行冒泡排序,首先比较
,需要交换1次位置,得到新序列
,然后比较
,无需交换位置,最后比较
,又需要交换1次位置,得到新序列
,最终完成了冒泡排序.同样地,序列
需要依次交换
,
完成冒泡排序.因此,
和
均是交换2次的序列.现在对任一个包含n个不等实数的序列进行冒泡排序(
),设在冒泡排序中序列需要交换的最大次数为
,只需要交换1次的序列个数为
,只需要交换2次的序列个数为
,则下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed7b442e78e34e20513eda80b994057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d2b73d53e55ed235678b902b04b5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aadf9ab510510120699c5eee39ab18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef7fb37eb0663328147e890fe3743ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c11df207bfbfecfeda5b0dedff71986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30511e6903e1c1f9a8fedbcf916ca5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5363def6ab70faf774f1fc601977ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec69d27edd7577262f2d23a26ef858b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104431dedcf68e8bee516d4d14de765d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36bf49f0fea361cb1e0d5fd9fb304003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f920d9bb6f755983c74df6ace9b54b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7845a338b3b64ae887423611ec7301e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104431dedcf68e8bee516d4d14de765d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c11df207bfbfecfeda5b0dedff71986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f920d9bb6f755983c74df6ace9b54b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
9 . 若正项无穷数列
是等差数列,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aca46766c0a0c10fc0c8d4c35868ccd.png)
A.![]() |
B.当![]() ![]() |
C.公差d的取值范围是![]() |
D.当![]() ![]() |
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解题方法
10 . 不经过第四象限的直线
与函数
的图象从左往右依次交于三个不同的点
,
,
,且
,
,
成等差数列,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4c6592bbbee1498da630bd431299fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132668fc41c8266ba917dc5b4995c6b7.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/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0a4d02005ed2c048b59856ad98c030.png)
您最近一年使用:0次
2024-05-14更新
|
216次组卷
|
2卷引用:重庆市第一中学校2023-2024学年高二下学期5月月考数学试题