1 . 已知等差数列的前
项和为
,且满足
.
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546e12c898d812317d8e453f140b9c73.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d083a7a5538ad18ca1780f28a183cfe.png)
您最近一年使用:0次
解题方法
2 . 设等差数列
的前
项和为
,且
,
.
(1)求
的通项公式;
(2)求证:
.
![](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/23252f8c60ef9aa621259c1ff403050a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3ae20bc2ab37f179484d83db63914c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79de22b9254daed9d24dbe7a74549347.png)
您最近一年使用:0次
2023-03-13更新
|
1394次组卷
|
5卷引用:湖北省恩施州巴东县第三高级中学2022-2023学年高二下学期6月第四次月考数学试题
解题方法
3 . 已知公差为
的等差数列
的前
项和为
,且
.
(1)求
的通项公式;
(2)若数列
的前
项和为
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.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/75261f63ca7ec7532f2837f3250a6f0c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.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/9925f0881adaa92609e67d2804614d9a.png)
您最近一年使用:0次
2023-06-29更新
|
404次组卷
|
2卷引用:湖北省孝感市部分学校2022-2023学年高二下学期期末联考数学试题
名校
解题方法
4 . 设
为数列
的前n项和,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/924715c03041e8f84f755abc5dffb1e6.png)
(1)证明:数列
是等差数列;
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/924715c03041e8f84f755abc5dffb1e6.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39fe0bf16d617721a0a45e2980884982.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
您最近一年使用:0次
2022-01-11更新
|
812次组卷
|
3卷引用:湖北省鄂州市第二中学2023-2024学年高二上学期12月月考数学试题
5 . 已知正项等差数列
的前
项和为
,若
构成等比数列.
(1)求数列
的通项公式.
(2)设数列
的前
项和为
,求证:
![](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/e34a0ee8a3c6bccf70cf908a85ca6a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57654f9b24388785c49ff4fc3496c2f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba57c83d526ac308d1461e80fcca9f36.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/76ab3b747e31fd1f95af4961b7b6a8bd.png)
您最近一年使用:0次
2021-03-31更新
|
5424次组卷
|
12卷引用:湖北省荆州市2022-2023学年高二下学期期中数学试题
湖北省荆州市2022-2023学年高二下学期期中数学试题湖北省十堰市丹江口市第一中学2021-2022学年高二下学期五月月考数学试题(2)江西省南昌市八一中学2020-2021学年高二下学期期末数学(文)试题广东实验中学附属天河学校2020-2021学年高二下学期第一次月考数学试题湖南省邵阳市第二中学2021-2022学年高二下学期期中数学试题宁夏石嘴山市第三中学2024届高三上学期期中数学(理)试题二轮复习联考(一)2021届高三数学文科试题(已下线)专题20 数列综合-2020年高考数学母题题源全揭秘(浙江专版)(已下线)考点22 数列的综合应用-备战2022年高考数学一轮复习考点帮(浙江专用)(已下线)专题2.3 数列-常规型-2021年高考数学解答题挑战满分专项训练(新高考地区专用)广东省广州市真光中学2022届高三上学期11月月考数学试题黑龙江省哈尔滨市双城区兆麟中学2020-2021学年高三上学期期中考试数学(理科)试题