18-19高二下·上海浦东新·期末
名校
1 . 数列
是公差不为零的等差数列,其前
项和为
,若记数据
,
,
,
,
的标准差为
,数据
,
,
,
,
的标准差为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e24489256e5d03305ce920673ff9a47.png)
________
![](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/08eb71ecf8d733b6932f4680874dbbf3.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/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec3004937aab88c44e66753caab782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e771f741fc6fda85726465e2ecf5193b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ce472cb48b49f019a7b3c1132e73e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fffe2c086360e30184b239b4463c7a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436b003ca2ebe125b127418b41785e3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6f23abd2f971b6fe4f22b7abd22d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b862840675bbec83a15e2d385704d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e24489256e5d03305ce920673ff9a47.png)
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名校
2 . 等差数列
中,若
且
,则下面结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df610dbf6ec2555a7f0510cbac8d05f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7adb182eb756adcb7f0ea0dfa1c4d6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-03-05更新
|
508次组卷
|
3卷引用:江苏省苏州市常熟中学2019-2020学年高二上学期12月月考数学试题
名校
解题方法
3 . 设等差数列
的前n项和为
,已知
,
,则当n为多少时前n项和有最大值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb23a0aa533fe2f67a50551bb7772ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9187689056ca86397b388a68f7f63ac.png)
A.6 | B.5 | C.6或7 | D.7 |
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2020-03-04更新
|
372次组卷
|
2卷引用:云南省玉溪市第一中学2018-2019学年高一下学期期中数学(文)试题
4 . 已知等差数列
的前3项和为30,后3项和为90,且前
项和为200,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/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.9 | B.10 | C.11 | D.12 |
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5 . 已知非零实数
、
和1成等差数列,直线
与椭圆
:
恒有公共点,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a3d5bc1b05da4d8f7049538431a6bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee90308b625426e950e32580409a06b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() ![]() |
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2020-02-15更新
|
276次组卷
|
2卷引用:重庆市育才中学2018-2019学年高一下学期期末数学试题
名校
解题方法
6 . 已知
是首项为
、公比
的等比数列,且满足
、
、
成等差数列.
(Ⅰ)求
的通项公式;
(Ⅱ)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47153fdd73c0661fa460130082e30929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411641715d7f5132c34f1d6eace8cd8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b9cd349aec2e1b449ae3a293b0c94c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74cba4c68910a874ba56a92d47d35892.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/08eb71ecf8d733b6932f4680874dbbf3.png)
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7 . 已知数列{an}中,相邻两项an,an+1是关于x的方程:x2+3nx+bn
0(n∈N*)的两实根,且a1=1.
(1)若Sn为数列{an}的前n项和,求S100 ;
(2)求数列{an}和{bn}的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af2a485b3210a701c4bded52599a8b9.png)
(1)若Sn为数列{an}的前n项和,求S100 ;
(2)求数列{an}和{bn}的通项公式.
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8 . 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/b9181faef8aec569c65057672e09af93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759ed3cc61e6769e033158d060a16d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254cff7d37ea8004d02d86f641f8bbe5.png)
A.28 | B.25 | C.20 | D.18 |
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2020-05-01更新
|
223次组卷
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2卷引用:广东省惠州市2018-2019学年高三上学期第一次调研(7月)数学(文)试题
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9 . 若
是等差数列,首项
,
,
,则使前
项和
成立的最小正整数
是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce17c606cf18352c6e7e663c9714c671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22936db63a9081235ffc284f5076a5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937228faf3b035ce9fb607ec96f707f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-04-14更新
|
990次组卷
|
5卷引用:辽宁师范大学附属中学2018-2019学年高二上学期第一次模块考试数学试题
辽宁师范大学附属中学2018-2019学年高二上学期第一次模块考试数学试题吉林省辽源市东辽县第一高级中学校2019-2020学年高一下学期期中考试数学试题(已下线)专题27 等差数列与等比数列问题的精彩妙解-备战2022年高考数学一轮复习一网打尽之重点难点突破(已下线)6.1 等差数列(精练)(提升版)-1辽宁省沈阳市东北育才学校2015-2016学年高二上学期第二次段考数学试题(理科)
名校
10 . 已知数列
、
都是等差数列,
、
分别是它们的前
项和,并且
,则
( )
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcb70a0c6aebc2c0e1735ee1a82d89a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3173627e9b1c6b62125b606013330de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-12-12更新
|
880次组卷
|
3卷引用:江苏省扬州市扬州中学2019-2020学年高二上学期期中数学试题
江苏省扬州市扬州中学2019-2020学年高二上学期期中数学试题(已下线)专题02 等差数列和等比数列的性质-2020-2021学年高二数学数列专题复习课(人教A版2019选择性必修第二册)四川省遂宁市射洪中学2023-2024学年高二下学期第一次半月考数学试题