名校
解题方法
1 . 已知正项数列
的前
项和为
,且
.
(1)求
的通项公式;
(2)令
,数列{
}的前
项和为
,证明:对于任意的
,都有
.
![](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/96bfa1719c28e354760d7b79f696f1ef.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82ecbca314a76a2cc7ba40066813296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.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/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aad2720f857e1e3290eabd1998d3439.png)
您最近一年使用:0次
2 . 已知数列
满足
.
(1)设
,求证数列
为等差数列,并求数列
的通项公式;
(2)设
,数列
的前n项和
,是否存在正整数m,使得
对任意的
都成立?若存在,求出m的最小值;若不存在,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92c7a8a35af1329ce9c09cf124be32b.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d48868b259993d0000b7c47525ebcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a822f46794cb60b40400892abb8c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b011ad39b7c616d2004a58d8678d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aba7b2970bad263810840bd0b9ca8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209591cfb9f8271f5ad48d89f214f22e.png)
您最近一年使用:0次
2022-10-08更新
|
1104次组卷
|
7卷引用:福建省连城县第一中学2022-2023学年高二上学期月考(一)数学试题
福建省连城县第一中学2022-2023学年高二上学期月考(一)数学试题湖南省岳阳市临湘市2021-2022学年高二上学期期末教学质量检测数学试题甘肃省酒泉市敦煌市敦煌中学2022-2023学年高二上学期9月月考数学试题湖北省新高考9+N联盟部分重点中学2022届高三上学期11月联考数学试题(已下线)4.2.1等差数列的概念(第1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)吉林省长春市实验中学2022-2023学年高二上学期期末数学试题陕西省西安市铁一中学2023-2024学年高二上学期期中数学试题
名校
解题方法
3 . 设
为数列{
}的前n项和,已知
,且
.
(1)证明:{
}是等比数列;
(2)若
成等差数列,记
,证明
<
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d6a016b6cb27047fa22682a4846ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9efeb4455e30293d412938eeea85d5.png)
(1)证明:{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4294cb4b3f97d61bf7569aaa54b8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd89ddf27359acf69523df80335878c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915f4eeb65f99ad54800f4624eba1032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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2022-11-11更新
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3卷引用:福建省龙岩市一级校联盟(九校)联考2023届高三上学期期中考试数学试题
4 . 记
为数列
的前
项和,已知
是公差为
的等差数列.
(1)求
的通项公式;
(2)记
,试判断
与2的大小并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90542e5b445159f78f8c7cedf43033b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1dd362f843e640ce551ad1787c9873.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57420a00abdf4a3697642e967134b164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2022-10-20更新
|
763次组卷
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4卷引用:福建省龙岩第一中学2022-2023学年高二上学期第二次月考数学试题
福建省龙岩第一中学2022-2023学年高二上学期第二次月考数学试题福建省龙岩第一中学2022-2023学年高二(实验班)上学期第二次月考数学试题(已下线)【题型分类归纳】2022-2023学年高二数学同步讲与练(空间向量与立体几何、直线与圆、圆锥曲线、数列)(已下线)4.2.2等差数列的前n项和(第1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)
5 . 在数列{an}中,已知
,
(
)..
(1)证明:数列
为等比数列.
(2)记bn=
,数列{bn}的前n项和为Sn,求Sn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0391da6e1057ac401356adfab040e182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1f82d1543a9d2ad851af9d0518c6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3ede255fecf6aba650c90309d62670.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fba1a0798c6b61b7213f1e9c872beb1.png)
(2)记bn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87aac3d8f89053fe3762ab3fba98ee78.png)
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2022-10-20更新
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3卷引用:福建省连城县第一中学2023届高三上学期第一次月考数学试题
福建省连城县第一中学2023届高三上学期第一次月考数学试题上海市金山中学2022-2023学年高二下学期期末数学试题(已下线)专题01 数列(九大题型+优选提升题)-【好题汇编】备战2023-2024学年高二数学下学期期末真题分类汇编(沪教版2020选择性必修,上海专用)
名校
解题方法
6 . 已知等比数列
的首项
,公比
,数列
.
(1)证明:数列
为等差数列;
(2)设数列
前
项和为
,求使
的所有正整数
的值的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082511a3f73cf5adab756b793a20e38b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07e870034a05dd9ffcd6be3c0b50625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991c2af99e98576ce3db18189dda8702.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8011f8795212e99b8bb96e2ba7445076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
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2022-10-20更新
|
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|
2卷引用:福建省龙岩第一中学2022-2023学年高二上学期第二次月考数学试题
7 . 森林资源是全人类共有的宝贵财富,其在改善环境,保护生态可持续发展方面发挥重要的作用.为了实现“到2030年,中国的森林蓄积量比2005年增加60亿立方米”的目标, A地林业管理部门着手制定本地的森林蓄积量规划.经统计, A地2020年底的森林蓄积量为120万立方米,森林每年以25%的增长率自然生长,而为了保证森林通风和发展经济的需要,每年冬天都要杴伐掉
万立方米的森林.设
为自2021年开始,第
年末的森林蓄积量(例如
).
(1)试写出数列
的一个递推公式:
(2)设
,证明:数列
是等比数列;
(3)若到2030年末,A地要实现“森林蓄积量要超过640万立方米”这一目标,那么每年的砍伐量
最多是多少万立方米?(精确到1万立方米)参考数据:
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbb86067f35b021e2b7e3b8e7bc70ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6223ceb81889834cb596895776941d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56aff749abd1b92937b3fcd66fd4d25d.png)
(1)试写出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2502f2d95b77c931453c2f836e5ce539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)若到2030年末,A地要实现“森林蓄积量要超过640万立方米”这一目标,那么每年的砍伐量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fb3f6820d99fe581f6016b0208036b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b40e694bf4509aabe5e2867f39c0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbb86067f35b021e2b7e3b8e7bc70ed.png)
您最近一年使用:0次
2022-06-28更新
|
869次组卷
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5卷引用:福建省龙岩第一中学2022-2023学年高二(普通班)上学期第一次月考数学试题
8 . 对于数列
,若从第二项起,每一项与它的前一项之差都大于或等于(小于或等于)同一个常数
,则
叫做类等差数列,
叫做类等差数列的首项,
叫做类等差数列的类公差.
(1)若类等差数列
满足
,请类比等差数列的通项公式,求出数列
的通项不等式(要写出证明过程);
(2)若数列
中,
,
.判断数列
是否为类等差数列,若是,请证明;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7936359df4c926b72b48c6fdae55f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(1)若类等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d140c40a0f4e3c98d71437828245a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddda8e6c1ea80647c96a6b89ee544e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
您最近一年使用:0次
9 . 已知数列
满足
,且
,若
,
的前
项和为
.
(1)求证:
为等比数列,并求
的通项公式;
(2)求
,并求满足不等式
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/f639aa2fde8c717aa78e22e13daab1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4a67138f29758d025473086601cef0.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)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d363b6982fee3bf1337d1542137a2f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f43755e8ef3a411a9abe8c1237d81f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2022-03-16更新
|
870次组卷
|
4卷引用:福建省上杭县第一中学2023届高三上学期12月月考数学试题
10 . 已知等差数列
的前n项和为
,
,
.
(1)求
的通项公式;
(2)设
,数列
的前n项和为
,证明:当
,
时,
.
![](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/ebfd6e425411179e2a5a06d84978356e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e26faf2d524402fefa06823506d1971.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0653a84881d44b19a9d8e279b0848d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b00438433719b82971f9fe309e04b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d92aecace7dc4cd358046088999c2b.png)
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2022-05-06更新
|
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4卷引用:福建省龙岩市2022届高三第三次教学质量检测数学试题