数列
中,
.
(1)
是数列中的第几项?
(2)
为何值时,
有最小值?并求最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a162bef78b46c852ecbb1fd283fe0c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
19-20高一下·安徽滁州·阶段练习 查看更多[4]
安徽省滁州市定远县育才学校2019-2020学年高一下学期第一次检测数学试题(已下线)5.1.1 数列的概念-2020-2021学年高二数学课时同步练(人教B版2019选择性必修第三册)(已下线)第五章 数列 5.1 数列基础 5.1.1 数列的概念(已下线)4.1数列(备作业)-【上好课】2021-2022学年高二数学同步备课系列(苏教版2019选择性必修第一册)
更新时间:2020-08-16 08:59:28
|
相似题推荐
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐1】已知公差不为零的等差数列
的前n项和为
,
, 且
成等比数列.
(1)求数列
的通项公式;
(2)设
试问数列
是否存在最大项?若存在,求出最大项序号n的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9651204c54475c2e8cda8d0a6eeba177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f486792d2f548ee6aeb7b634e3a384.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbe4fcb9bc7218029f47b8f27a85bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】在①
,②
,③
这三个条件中任选一个,补充在下面问题中,并解答.
已知等差数列
的公差为
,等差数列
的公差为
.设
分别是数列
的前
项和,且
, ,
(1)求数列
的通项公式;
(2)设
,试问数列
是否有最小项,若有,求出其最小项;若没有,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a531b7d71c013a1ccbc53409110fe3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48c29a9c2519b12ee4806b96840f3dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eefa33051da24aff9147e61562e5fea.png)
已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe9369621149328a9e5629bc5314604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57124599d0a72bf788f08ce442a85600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b64f109cde567dc5750276a16a6b774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca8b975535924dd6f656554ed9fe23b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d158d059b21f53034885a55cd63bf4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a107ab533d39b3bd0933429156ff33bb.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】已知数列
的通项公式是
,那么56是这个数列中的项吗?如果是,那么是第几项?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da255cff0da6c8aebf385c9b9e5b258.png)
您最近一年使用:0次
解答题-作图题
|
较易
(0.85)
【推荐2】写出下列数列的前10项,并作出它们的图象.
(1)当自变量
依次取1,2,3,…时,函数
的值构成的数列
;
(2)数列
的通项公式为
.
(1)当自变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d01cb00904ee16178c7c35d7e0a8d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db31b54d2d4127513ff36ca60060f11f.png)
您最近一年使用:0次