名校
解题方法
1 . 已知
是等差数列,其前n项和为
,
再从条件①条件②这两个条件中选择一个作为已知,求:
(1)数列
的通项公式;
(2)
的最小值,并求
取得最小值时n的值.
条件①:
;条件②:
.
![](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/25e17d82f17d4665d6117227e832ab34.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5baffda277da9f6563f4b24dc33ef623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b108abcbf7090b2ed3ba6408ce8b91.png)
您最近一年使用:0次
2023-02-26更新
|
448次组卷
|
6卷引用:一轮复习大题专练39—数列(最值问题1)-2022届高三数学一轮复习
(已下线)一轮复习大题专练39—数列(最值问题1)-2022届高三数学一轮复习北京市房山区2020-2021学年高二下学期期中检测数学试题北京市丰台区2021-2022学年高二下学期期中联考数学试题(B卷)北京市顺义区第一中学2021-2022学年高二下学期期中考试数学试题北京市第二十五中学2022-2023学年高二下学期期中考试数学试题 (已下线)4.2.2等差数列的前n项和公式(第1课时)(分层作业)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第二册)
2 . 已知数列{
}的前n项和
满足:
.
(1)求数列{
}的前3项
;
(2)求证:数列
是等比数列;
(3)求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab451d864c3520bc685e2b3e2dbceae.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c14d9ae06f864498048d55088ff4e6.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf22d124df4c081852aed169daa03219.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5541f325a4ec7149bb3e851e8c3dd4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2022-02-19更新
|
1500次组卷
|
10卷引用:专题7.15 数列大题(讨论奇、偶 )-2022届高三数学一轮复习精讲精练
(已下线)专题7.15 数列大题(讨论奇、偶 )-2022届高三数学一轮复习精讲精练(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)天津市红桥区2021届高三下学期一模数学试题(已下线)第四章 数列单元测试(巅峰版)课时训练-【新教材优创】突破满分数学之2020课时训练-2021学年高二数学课时训练(人教A版2019选择性必修第二册)天津市红桥区2021届高三一模数学试题(已下线)思想02 分类与整合思想(讲)--第三篇 思想方法篇-《2022年高考数学二轮复习讲练测(浙江专用)》(已下线)重难点02 数列-2022年高考数学【热点·重点·难点】专练(全国通用)(已下线)思想02 分类与整合思想(讲)--第三篇 思想方法篇-《2022年高考数学二轮复习讲练测(新高考·全国卷)》(已下线)2022年高考天津数学高考真题变式题10-12题(已下线)2022年高考天津数学高考真题变式题16-18题
2021高三·河北·专题练习
3 . 已知数列
的各项均为正数,
,其前
项和为
,且当
时,
、
、
构成等差数列.
(1)求数列
的通项公式;
(2)若数列
满足
,数列
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.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/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361792c6ea1ea5cbdd809e63b27c89a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e06de381c46e58d40aaced29d9297e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9750e655e8c9743c74db710641e1236e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.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)
您最近一年使用:0次
2021高三·河北·专题练习
解题方法
4 . 设数列
的前
项和为
,满足
,且
,
,
成等差数列.
(1)求
的值;
(2)求数列
的通项公式;
(3)证明:对一切正整数
,有
.
![](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/b34d9ad9a1e22e76b252d91125620cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d5791e7e0bd54d6433c1a4e1fecb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)证明:对一切正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e5aefa9824c51c75620e30c450c34d.png)
您最近一年使用:0次
2021高三·河北·专题练习
解题方法
5 . 已知数列
的各项均为正数,记数列
的前
项和为
,数列
的前
项和为
,且
,
.
(1)求
的值及数列
的通项公式;
(2)若有
,求证:
.
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.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/730d2e341ae94fa64bf124f796ea7c26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa8c9c182a24a0fa4529c94e05b1c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/088ae4935f17775ce3c14e0f1d09e852.png)
您最近一年使用:0次
解题方法
6 . 已知数列
满足:
,点
在函数
的图象上,其中
为常数,且
.
(1)若
,
,
成等比数列,求
的值;
(2)当
时,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/309c7c0eb1cd96ed925b8f19c27cd246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ebce8b2a915356ed39f36c5bad2ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
(1)若
![](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/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e788c32187ae2cc97aaa24da1d40d.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
解题方法
7 . 已知正项数列
的前
项和为
,满足
.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
,并证明
.
![](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/8e6d4d64f295f5edd6a1eb8738a72bd0.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec2c7201c44d51e81a7e60e61a3b6d4.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311a2e927dd85297a6f28aa74c74df35.png)
您最近一年使用:0次
解题方法
8 . 已知
是公差不为零的等差数列,
,且
,
,
成等比数列.
(1)求数列
的通项公式;
(2)设
,数列
的前
项和为
,求使
成立的最小正整数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.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/f65fc200f10b97588a0c9896277c9c64.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8acefe8faabbe856bd6603efb0ed5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解题方法
9 . 已知正项数列
的前n项和为
,
,当
时,
是
与
的等差中项.
(1)求数列
的通项公式;
(2)记
,求数列
的前n项和
.
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc5735838e43b7a229e8f45c9bfffb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361792c6ea1ea5cbdd809e63b27c89a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e06de381c46e58d40aaced29d9297e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07035078c627986d2a9a55599e3813f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
名校
解题方法
10 . 无穷数列
满足:
且
.
(1)求证:
为等差数列;
(2)若
为数列
中的最小项,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c40ca8feca9d6e67a953b054a4afac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6964835d9a0b524385d758cda92292.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f270f93bd638bc4ec3204b400ec13e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90707999e8fc89ae1137e5115c39f637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
您最近一年使用:0次
2021-07-18更新
|
1036次组卷
|
8卷引用:一轮复习大题专练39—数列(最值问题1)-2022届高三数学一轮复习
(已下线)一轮复习大题专练39—数列(最值问题1)-2022届高三数学一轮复习上海市建平中学2020-2021学年高二下学期期末数学试题(已下线)4.1等差数列及其通项公式(第1课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(已下线)4.2.1等差数列的概念(第2课时)(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)(已下线)4.2.1.1 等差数列的概念(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)2023版 苏教版(2019) 选修第一册 突围者 第4章 第二节 课时1 等差数列的概念、等差数列的通项公式(已下线)4.2.1 等差数列的概念(3)河南省南阳市西峡县第二高级中学2023-2024学年高二下学期开学考试数学试题