1 . 若正项数列{an}的前n项和为Sn,2Sn=an2+an(n∈N+).
(1)求数列{an}的通项公式;
(2)令bn
,求数列{bn}的前n项和Tn.
(1)求数列{an}的通项公式;
(2)令bn
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749cc7a690d4aa133892ae8d3a36a32a.png)
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安徽省六安市第一中学2021-2022学年高三上学期第四次月考理科数学试题湖北省荆门市龙泉中学2018-2019学年高二上学期10月月考数学试题(已下线)专题4.7 数列(基础巩固卷)-2021-2022学年高二数学特色专题卷(人教A版2019选择性必修第二册)(已下线)专题4.4 裂项相消法求和-2021-2022学年高二数学特色专题卷(人教A版2019选择性必修第二册)福建省厦门第一中学2021-2022学年高一下学期期中考试数学试题浙江省杭州第九中学2021-2022学年高二上学期期末数学试题广西壮族自治区玉林市博白县中学2024届高三上学期10月月考数学试题甘肃省庆阳市第二中学2023-2024学年高二上学期期末数学试题
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2 . 设等差数列
,
的前n项和分别是
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb4a6b67a4b8fede7b2ce33535e6906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df196d02cacf2fe97cd483eff3f4fc6b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 在等差数列
中,已知前n项和为
,
,
.
(1)求数列
的通项公式及
的表达式;
(2)设
,求数列
的前n项和
的表达式.
![](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/f25aec899081e8becb10b0e3f7418e02.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab59fe7bb6eab1764ef233599aaa3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解题方法
4 . 已知数列
的前
项和为
,2,
,
成等差数列.
(1)求数列
的通项公式;
(2)设
,求数列
的前
项和
.
![](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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf263f6ca69643a5211a5cccb587490.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)
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解题方法
5 . 已知等差数列
的前n项和
,
.
(1)求k、t的值以及数列
的通项公式;
(2)若
,求
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5af9cbb37580c9f1e5058de19d3d667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302ae08810ef07e1ec320eb3ae8dbd48.png)
(1)求k、t的值以及数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ebf05ca12f9da810b2b10e066ececf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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6 . 设数列
的前n项和为
,若
,且
是等差数列.则
的值为__________ .
![](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/ab8c8e74213dd6be2dd4d34c1aae3817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f9455bb1be0546692d9b0cfdcc9017.png)
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安徽省六安市第一中学2021-2022学年高二上学期期末数学试题(已下线)4.2等差数列C卷单元综合测试-数列(已下线)第四章 数列章末检测卷(一)-【帮课堂】2022-2023学年高二数学同步精品讲义(人教A版2019选择性必修第二册)福建省漳州市东山县2023-2024学年高二上学期期中数学试题(已下线)4.2.2 等差数列的前n项和公式——课后作业(巩固版)
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解题方法
7 . 已知Sn为正项数列{an}的前n项和,且满足
(n∈N*).则an=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61283cf2ddcddbf4190162b7c9510290.png)
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安徽省合肥市第十一中学2020-2021学年高二上学期开学考试数学试题贵州省思南中学2020-2021学年高二上学期期中考试数学试题(已下线)专题13 盘点数列的通项公式的求法——备战2022年高考数学二轮复习常考点专题突破(已下线)类型一 等差数列-【题型突破】备战2022年高考数学二轮基础题型+重难题型突破(新高考专用)
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解题方法
8 . 设等差数列
,
的前n项和分别是
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb4a6b67a4b8fede7b2ce33535e6906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/210dfd77bd31e0ecfee86db01f9bb7e4.png)
A.1 | B.![]() | C.![]() | D.2 |
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解题方法
9 . 已知正项数列
的前
项和为
,且
是
与
的等比中项.
(1)求
的通项公式;
(2)设
,数列
的前n项和为
,若对于任意
,均有
恒成立,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/a3d6842e606f28a728e34873f29657d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6acff4900b76f30f791615b50437d7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3227d7309c977e42ceefd56e48cfc4fc.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/caa538b9af33d239597b9a739d5ae0d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb4c4ce381efd73cdccc72ce9e53ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
10 . 等差数列
的前
项和
,等比数列
的前
项和
,(其中
、
为实数)则
的值为 __________ .
![](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/31e25fc313c5775ecc5916615e5e0b8a.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/c211829c74b6fd13d5312645af426b02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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