解题方法
1 . 已知各项为正数的等差数列
的前
项和为
,
,且
,
,
成等比数列.
(1)求
;
(2)若
,求
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/eb2c8dedfa4e56af166f7a3f6bd91ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aed2767af12491e573e1243e8a246f9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0138d1c1aef8123c18084fe3567ee0.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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2 . 已知等差数列
为递增数列,且
,
都在
的图像上.
(1)求数列
的通项公式和前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
,求数列
的前
项和
,且
,求
取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4822d1ee2ce99b66b8af149c134450d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80fb2649557400f7248b3396317356b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8963448885be6f448295fa57e4ac078e.png)
(1)求数列
![](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)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6489d661e8b58daaeeb12e8b0e69375f.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/ea2c2ab00277038b930dbcd9ae3be58a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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3 . 已知等差数列
的前
项和为
,
是各项均为正数的等比数列,
,________,
,
.在以下三个条件中任选一个①
,②
,③
,补充在上面横线上,并作答.
(1)求数列
,
的通项公式;
(2)是否存在正整数
.使得数列
的前
项和
?若存在,求
的最小值;若不存在,说明理由.
注:如果选择多个条件分别解答,按第一个解答计分.
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a453294dd3b3323b00f05d7b79008408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881f97c0f967fab6c98f20ef721154c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175a5fc6082f65443f24a20195cbfff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd478b1ba0e42545b45d505e2e84a140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9b2392bd67dc2427bf0654ec0d7857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c68f845e31741a7fa9aa8546904cbf.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8050391385b496e9c059201e4f12600a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42cf7eef3bb1bb2f5098794e5a8c4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
名校
解题方法
4 . 已知数列
的前
项和为
,
,
,
,其中
为常数.
(1)证明:
;
(2)若
为等差数列,求
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa01f03fb074bff35b35e07047d11b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdc305f1ec88235947e0d137dc0fb75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce8429376dc577ccfbc9e34cd41986b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
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2022-02-24更新
|
259次组卷
|
5卷引用:江苏省百校联考2021-2022学年高三上学期第一次考试数学试题
5 . 已知等差数列
的首项为2,前
项和为
,正项等比数列
的首项为1,且
,
.
(1)求数列
,
的通项公式;
(2)设
,求数列
的前26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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb2818c28c62b91139279a0503f69ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b872aaaece2990776ac6df0e0176144.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c3f55a9a560db4b248cf04bf2ad16bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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2022-02-21更新
|
679次组卷
|
2卷引用:广东省揭阳华侨高级中学2022届高三上学期第二次阶段考试数学试题
名校
解题方法
6 . 在等差数列
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c43f5d0392cef546f47d63233e21e7a.png)
(1)求数列
的通项公式;
(2)设
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c43f5d0392cef546f47d63233e21e7a.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3c2263e48afd4f7b961a1ed4539222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f007ff257963f00a02b4bb12e6fa90ec.png)
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2022-02-15更新
|
1933次组卷
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5卷引用:吉林省通化市梅河口市第五中学2021-2022学年高二上学期期中数学试题
7 . 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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2022-02-14更新
|
245次组卷
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2卷引用:安徽省安庆市怀宁中学2021-2022学年高三上学期12月联考理科数学试题
名校
解题方法
8 . 等差数列
中,公差d<0,
=-8,
=7.
(1)求
的通项公式;
(2)记
为数列
前n项的和,其中
,
,若
≥1464,求n的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de8fa7320eb6b686f7c8ef1a60d6517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9f4591675389ef5501bcd9327132a2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bfc486801df4f08cf49f5d4da289195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1505d56f0b35fe7f2de1fe1888036e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2023-03-30更新
|
941次组卷
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8卷引用:福建省华安县第一中学2022届高三上学期期中考试数学试题
福建省华安县第一中学2022届高三上学期期中考试数学试题四川省成都市龙泉中学2017-2018学年度高三上学期12月月考数学(文科)试题河北省曲周县第一中学2018届高三12月质量检测(四)数学(文)试题湖北省荆州市松滋市言程中学2020-2021学年高二上学期9月月考数学试题(已下线)第27讲 等差数列及其前n项和(练)- 2022年高考数学一轮复习讲练测(课标全国版)江西省南昌市第十九中学2022-2023学年高二下学期第一次(3月)月考数学试题(已下线)第二节 等差数列(讲)陕西省咸阳市咸阳中学2023-2024学年高二上学期第三次阶段性检测数学试题
9 . 设{an}为等差数列,Sn为数列{an}的前n项和,已知S7=21,S15=-75,Tn为数列
的前n项和.
(1)求
的通项公式;
(2)求Tn的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dea1dd4ffcb4cf0697ca43079f6a1f2.png)
(2)求Tn的最大值.
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2022-02-11更新
|
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4卷引用:四川省内江市威远中学校2020-2021学年高一下学期6月月考数学(理)试题
四川省内江市威远中学校2020-2021学年高一下学期6月月考数学(理)试题四川省内江市威远中学校2020-2021学年高一下学期6月月考数学(文)试题(已下线)第4章 数列(单元基础卷)-2021-2022学年高二数学下学期考试满分全攻略(人教A版2019选修第二册+第三册)山东济宁市邹城市兖矿第一中学2022-2023学年高三上学期阶段考试数学试题
名校
解题方法
10 . 已知等差数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)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/d22824450db45bc104092954dccbafd2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bdbde4eb7e4d4033bb9053b6c806e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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