1 . 基本不等式:对于2个正数
,它们的算术平均数不小于它们的几何平均数,即
,当且仅当
时,等号成立.可以推广到一般的情形:对于
个正数
,它们的算术平均数不小于它们的几何平均数,
.当且仅当
时,等号成立.若无穷正项数列
同时满足下列两个性质:①
;②
为单调数列,则称数列
具有性质
.
(1)若
;求数列
的最小项;
(2)若数列
的前
项和为
,判断数列
是否具有性质
,并说明理由;
(3)若
,求证:数列
具有性质
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0158862238e250d2a2598b7d4ecd148.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140564fb2e11f8411e353d2fa73fbee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b2fb1017d5dfe3a300de3e14a71b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efff8ec14cb242e793afab4468bf2e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2617515e5ce81b3f5d9f4e806b21b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6879960be91ea52297d587e9a014f54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17fac66473a039bdb47c2a248b0f4854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9bb1963d176a00c82828c93ca0e2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d013861990cf331c82eb453416ae31bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4247739746b8ddf1403541047e8b5580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ab0309e2cd35585ea9fb2cc3017abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2 . 已知数列
满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8835310e62c3b17c579dae642cb166.png)
(1)求证:数列
为等差数列;
(2)求数列
的通项公式与最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8835310e62c3b17c579dae642cb166.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35440ebc1b87cbf08fe96c083c5bcc88.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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2024-01-02更新
|
1533次组卷
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5卷引用:黑龙江省哈尔滨市第九中学2023-2024学年高二下学期开学考试数学试卷
名校
3 . 设数列
的前
项和为
.已知
.
(1)求证:数列
为等差数列,并求出其通项公式;
(2)设
,又
对一切
恒成立,求实数
的取值范围;
(3)已知
为正整数且
,数列
共有
项,设
,又
,求
的所有可取值.
![](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/534de09e80dba6dbfffea53bdb74649f.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb517e8e8a582aeb9c17eab852a630a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f13e7c0b421f704dc0e6fad0c5a215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/effd163f8b1a235eb67227956e3652e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f1512cee17305b8936f6c61b0a22b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
4 . 已知数列
中,
,
.
(1)证明数列
是等差数列,并求通项公式
;
(2)若对任意
,都有
成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d676517bbb3c12d5028540db285ce0.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099a64d86bd0b4602578d910322adc1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b613c5aecd398b3b92a2f00f53f48033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a7884e81b4504be6bf808a99b721de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2023-01-11更新
|
1046次组卷
|
5卷引用:江苏省苏州市张家港市沙洲中学2023-2024学年高二上学期开学检测数学试题
5 . 已知数列
中,
,数列
满足:
.
(1)求证:数列
是等差数列,并求数列
的通项公式;
(2)求
的值;
(3)求数列
中的最大项和最小项,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61054cd9251ae9646d3dcbcf41efa28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19aec23982fb581ab92aa0dc4e254cad.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185e26413d7faabfaf59114fe16c7b80.png)
(3)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2011·云南昆明·一模
名校
6 . 已知数列
的前
项和
.
(1)求证:数列
是等差数列.
(2)若不等式
对任意
恒成立,求
的取值范围.
![](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/851afb5fa82c3e4448ac7b674d143cdf.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61f15ce440e46d535a123d5149b3a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2022-03-22更新
|
815次组卷
|
4卷引用:江苏省南京市第十三中学2021-2022学年高二下学期初数学试题
江苏省南京市第十三中学2021-2022学年高二下学期初数学试题广东省大湾区2022-2023学年高二上学期期末联考数学试题(已下线)2011届云南省昆明市高三5月适应性检测理科数学试题湖南省娄底市新化县五校联盟2022-2023学年高三上学期期末联考数学试题
名校
解题方法
7 . 在数列
中,
,
,记
.
(1)求证:数列
为等差数列,并求出数列
的通项公式;
(2)试判断数列
的增减性,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbdfea553673d342e6e2af7e249594b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645e6f25500f354180da1c59ef38776f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97da2386d1c222fbf39a800125cc464f.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)试判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
2022-02-10更新
|
410次组卷
|
3卷引用:湖北省孝感市安陆市第一高级中学2021-2022学年高二下学期开学考试数学试题
湖北省孝感市安陆市第一高级中学2021-2022学年高二下学期开学考试数学试题湖北省荆州市沙市中学2021-2022学年高二上学期期末数学试题(已下线)第02讲 等差数列(核心考点讲与练)-2021-2022学年高二数学考试满分全攻略(人教A版2019选修第二册+第三册)
名校
解题方法
8 . 在数列{an}中,a1=1,3anan-1+an-an-1=0(n
2,n∈N*).
(1)证明:数列
是等差数列;
(2)求数列{an}的通项公式;
(3)若λan+![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7e761be88728b3db50c2abd4377c12.png)
λ对任意的n
2恒成立,求实数λ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e119c508fd265e3e3d78749e54fe4f43.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
(2)求数列{an}的通项公式;
(3)若λan+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7e761be88728b3db50c2abd4377c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e119c508fd265e3e3d78749e54fe4f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e119c508fd265e3e3d78749e54fe4f43.png)
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2021-11-21更新
|
1458次组卷
|
8卷引用:江苏省苏州市高新区第一中学2021-2022学年高二上学期期初考试数学试题
江苏省苏州市高新区第一中学2021-2022学年高二上学期期初考试数学试题人教A版(2019) 选择性必修第二册 过关斩将 第四章 数列 4.2 等差数列 4.2.1 等差数列的概念人教B版(2019) 选修第三册 突围者 第五章 第二节 课时1 等差数列苏教版(2019) 选修第一册 一蹴而就 第4章 4.2.2 等差数列的通项公式(已下线)4.2.1-4.2.2 等差数列的概念及通项公式(课堂培优)-2021-2022学年高二数学课后培优练(苏教版2019选择性必修第一册)(已下线)第三课时 课后 4.2.1.1等差数列的概念与通项公式2023版 湘教版(2019) 选修第一册 过关斩将 第1章 1.2.1等差数列及其通项公式+1.2.2等差数列与一次函数北京名校2023届高三一轮总复习 第5章 数列 5.2 等差数列
名校
解题方法
9 . 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: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
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上海市建平中学2020-2021学年高二下学期期末数学试题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)4.1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)(已下线)4.2.1 等差数列的概念(3)(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
名校
解题方法
10 . 已知数列
的前
项和为
,满足
,数列
满足
,且
.
(1)证明数列
为等差数列,并求数列
和
的通项公式;
(2)若
,求数列
的前2n项和
;
(3)若
,数列
的前
项和为
,对任意的
,都有
,求实数
的取值范围.
![](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/deb64a2d5265b33d6c6727b956c9c29a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0ac6e090846e97ccedd2f6d9168bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f997e6d483c0d0990cb550bbde39fa9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b5eef03339913e27e0ce81d6f32b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a17951c56a2ebe66ef13d08135ac0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee6e88ac0b5133d7f51c7e166faf77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2021-08-17更新
|
782次组卷
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