1 . 如果有穷数列
(m为正整数)满足条件
,即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d58e15de1b07667b44bb0e187d43965.png)
,我们称其为“对称数列”.例如,数列1,2,5,2,1与数列8,4,2,2,4,8都是“对称数列”.
(1)设
是项数为7的“对称数列”,其中
是等差数列,且
.依次写出
的每一项;
(2)设
是49项的“对称数列”,其中
是首项为1,公比为2的等比数列,求
各项的和S;
(3)设
是100项的“对称数列”,其中
是首项为2,公差为3的等差数列.求
前n项的和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f42beacb05b4e0ef7bc5054d963657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd77932c26ce24576308c4ed4ffaff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d58e15de1b07667b44bb0e187d43965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c410d893ae9b389262bcd6553ed02bbe.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a447e5baee4f7518706498d4aca7553b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37315fc505a5be225c5b2d0aa3f5025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88f01c3f7abc6fb390b5f9bcbeef700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d717398566e4a7769dc4bb6865195f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45404a6c16a16968629c5e03a3fcdbc4.png)
您最近一年使用:0次
2022-11-09更新
|
385次组卷
|
3卷引用:沪教版(2020) 一轮复习 堂堂清 第四单元 4.2 等差数列
2 . 若一个数列的第
项等于这个数列的前
项的乘积,则称该数列为“
积数列”.若各项均为正数的等比数列
是一个“2020积数列”,且
,则当其前
项的乘积取最大值时,
的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d87fb02b08c88b0c9f27f839a7d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2021-09-20更新
|
316次组卷
|
5卷引用:沪教版(2020) 一轮复习 堂堂清 第四单元 4.7 数列的应用(二)
沪教版(2020) 一轮复习 堂堂清 第四单元 4.7 数列的应用(二)苏教版(2019) 选修第一册 必杀技 第四章 4.3.1 -4.3.2 等比数列(已下线)专题二检测 数列(练)-2022年高考数学二轮复习讲练测(新教材地区专用)(已下线)4.2 等比数列(第1课时)(十大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)(已下线)4.3.1.2 等比数列的性质及应用(练习)-2022-2023学年高二数学同步精品课堂(人教A版2019选择性必修第二册)
13-14高三·全国·课后作业
3 . 已知数列
:
,如果数列
:
满足
,
,其中
,则称
为
的“衍生数列”.若数列
:
的“衍生数列”是5,-2,7,2,则
为________ ;若
为偶数,且
的“衍生数列”是
,则
的“衍生数列”是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d02a8555da4dbbc7820a50a95b071ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f178daf0f98f101bb2c8d459ecd342e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7e6327ecd86c682863f4a89e619fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da65bfc5919df189631c53048808e4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47ae697409240121ca2b2481889b6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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