名校
1 . 已知数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)设
,数列
的前
项和为
,求
的最小值及取得最小值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/c8370a173854471a3eb27637993a3d5d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06e46321550cf196b4f150446b13c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2019-04-04更新
|
3433次组卷
|
8卷引用:【全国百强校】北京市中国人民大学附属中学2019届高三高考信息卷(一)文科数学试题
【全国百强校】北京市中国人民大学附属中学2019届高三高考信息卷(一)文科数学试题【市级联考】山东省济南市2019届高三3月模拟考试数学(文)试题2019届辽宁省实验中学高三模拟考试数学(文)试题山东省博兴县第一中学2018-2019学年高三4月月考数学(文)试题安徽省滁州市定远县重点中学2020届高三下学期6月模拟数学(文)试题(已下线)突破4.2.2 等差数列的前n项和课时训练-【新教材优创】突破满分数学之2020-2021学年高二数学课时训练(人教A版2019选择性必修第二册) 江苏省南京市2021届高三下学期二模数学试题福建省莆田第八中学2023届高三上学期入学模拟考试数学试题(一)
2 . 已知
为等差数列,
为其前
项和.若
,
,则公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
___ ;
的最大值等于___ .
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8e8f821111de8075e5c3dfb22a5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/210478c26c1fc5a7c34a9c6672140ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
3 . 在各项均为正数的等比数列{an}中,
,且a4+a5=6a3.
(Ⅰ)求数列{an}的通项公式;
(Ⅱ)设数列{log2an}的前n项和为Sn,求Sn的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4411fa03bcc48243458cd10266c92f3.png)
(Ⅰ)求数列{an}的通项公式;
(Ⅱ)设数列{log2an}的前n项和为Sn,求Sn的最小值.
您最近一年使用:0次
名校
4 . 设等差数列
的前
项和为
,且满足
,
.
(
)求
的通项公式.
(
)求
的前
项和
及使得
取到最大值时
的值并求出
的最大值.
![](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/4ac8419cf6c0e1d70ea5f5a9eb6dad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36989853e0d247e504b292e17d8a8cfb.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2018-03-19更新
|
1320次组卷
|
3卷引用:北京市东城二十二中2016-2017学年高一下学期期中考试数学试题
13-14高二下·北京西城·期末
解题方法
5 . 已知数列{an}是公差为﹣2的等差数列,a6是a1+2与a3的等比中项.
(1)求数列{an}的通项公式;
(2)设数列{an}的前n项和为Sn,求Sn的最大值.
(1)求数列{an}的通项公式;
(2)设数列{an}的前n项和为Sn,求Sn的最大值.
您最近一年使用:0次
12-13高三上·北京东城·期末
6 . 在等差数列
中,若
,
,则数列
的公差等于__________ ,其前
项和
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85a4098de9e43e97a401a4eab0a1fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c56f0d0b8d87a8bceb16c03fd048775.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)
您最近一年使用:0次
10-11高二上·福建福州·期中
名校
7 . 在等差数列{
}中,
=18,前5项的和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bccd6b7cf0721f738ea046cd6399ca7.png)
(1)求数列{
}的通项公式; (2)求数列{
}的前
项和的最小值,并指出何时最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bccd6b7cf0721f738ea046cd6399ca7.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://img.xkw.com/dksih/QBM/2010/11/26/1569918639202304/1569918644436992/STEM/3fbb28ca241348ac88a69e65b4b08403.png?resizew=13)
您最近一年使用:0次
2016-11-30更新
|
877次组卷
|
4卷引用:北京科技大学附属中学2020-2021学年高二上学期期末考试数学试题
北京科技大学附属中学2020-2021学年高二上学期期末考试数学试题(已下线)2010年福建省福州市高级中学高二上学期期中考试数学理卷广东省广东实验中学2019-2020学年高二上学期开学摸底考试数学试题黑龙江省哈尔滨市宾县第二中学2021-2022学年高二上学期期末数学试题
9-10高一下·河北邯郸·期末
名校
解题方法
8 . 已知等差数列
中,
为
的前
项和,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87a281b8d984b3681b3763d7e1446f7.png)
(1)求
的通项
与
;
(2)当
为何值时,
为最大?最大值为多少?
![](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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87a281b8d984b3681b3763d7e1446f7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次