解题方法
1 . 正项数列
的前n项和为
,已知
.
(1)求证:数列
为等差数列,并求出
,
;
(2)若
,求数列
的前2023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/4f3d6932ec9456cf5e4f37273a036a93.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8dfb2af5bfd44046042a50e6edc1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b20224f6ba644d885435646a9b91b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5087b65850c79e65452645719f176b.png)
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2卷引用:云南省“3+3+3”2023届高三高考备考诊断性联考(二)数学试题
名校
解题方法
2 . 已知首项为1的递增的等差数列
的前n项和为
,若
成等比数列.
(1)求
和
;
(2)求证:
![](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/37c0609f48ac7e62a55034ddd1be679d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8547379b2709230dfa6f4e52462c9b0a.png)
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2022-07-20更新
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2卷引用:云南省普洱市2021-2022学年高二下学期期末考试数学试题
名校
解题方法
3 . 已知等差数列
的前
项和为
,
,
.
(1)求
的通项公式;
(2)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/878c70d9a2c8da673f5cb88d26f7d16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf9f45329bae09f13ebc5a7fd2788a5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83dfb450d025aa482277a23dae8203b.png)
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2022-12-08更新
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10卷引用:云南省楚雄东兴中学2024届高三上学期10月考数学试题
名校
解题方法
4 . 已知公差不为0的等差数列
的前
项和为
成等差数列,且
成等比数列.
(1)求
的通项公式;
(2)若
的前
项和为
.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/84b6a4eea9a433a20f02bb6e453f4dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e216bf7310c2334ad072ce6b02285223.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4991360dd5394695ae39b85e89122c.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/aa33d6f116c61ab89224c1a9886861cd.png)
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8卷引用:云南师范大学附属中学2023届高三上学期高考适应性月考卷(六)数学试题
云南师范大学附属中学2023届高三上学期高考适应性月考卷(六)数学试题云南师范大学附属中学2022-2023学年高二上学期第二学段模块考试数学试题云南省昆明市第一中学2023届高三下学期数学复习试题广东番禺中学2022-2023学年高二上学期期末数学试题(已下线)仿真演练综合能力测试(二)河南省周口市项城市第一高级中学2022-2023学年高二上学期期末考试数学试题广东省广州市广东番禺中学2022-2023学年高二上学期期末数学试题(已下线)重难点专题04 数列求和-2022-2023学年高二数学重难点题型分类必刷题(人教B版2019选择性必修第三册)
5 . 在①
,②
这两个条件中选择一个补充在下面的问题中,然后求解.
设等差数列
的公差为
,前n项和为
,等比数列
的公比为q.已知
,
, .
(说明:只需选择一个条件填入求解,如果两个都选择并求解的,只按选择的第一种情形评分)
(1)请写出你的选择,并求数列
和
的通项公式;
(2)若数列
满足
,设
的前n项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d61a111ab981437a0f71e6b063d8185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581e74360d31e2038bde239255bdbf69.png)
设等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc70c2154b22590c91d9a23e47b5160b.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/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e96fafcc7b7f783d436f853449208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751859e4f0b1cb2c94fd5cca373de9af.png)
(1)请写出你的选择,并求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c2a5f8ec179b72b201c3c0a670612a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ea1675261a5929c77af42bd9a9d1ac.png)
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4卷引用:云南省曲靖市2023届高三第一次教学质量监测数学试题
解题方法
6 . 已知数列
的前
项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4371dde0b2287b15e2e7bba43f41c0f0.png)
(1)求
,并证明数列
是等差数列:
(2)若
,求正整数
的所有取值.
![](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/4371dde0b2287b15e2e7bba43f41c0f0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29fe4bc2252088eae3bc33bb3acce2ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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2023-03-14更新
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5卷引用:云南省文山州广南县第一中学校2024届高三上学期第一次省统测数学模拟试题
云南省文山州广南县第一中学校2024届高三上学期第一次省统测数学模拟试题广东省广州市2023届高三综合测试(一)数学试题专题13数列(解答题)江苏省扬州市宝应县2024届高三上学期期末模拟数学试题(已下线)第4章 数列单元测试基础卷-2023-2024学年高二上学期数学人教A版(2019)选择性必修第二册
7 . 记
为数列
的前
项和,已知
.
(1)证明:
是等差数列;
(2)若
,记
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/6f7847150a29eca2f0fccca9a1e72af3.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738dc67ac3b150252a964d1ffe3dfa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d9bc2dea229a96bcedd90bfce5ea0c.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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云南省马关县第一中学2023届高三第七次月考数学试题河南省百师联盟2023届高三一轮复习联考(四)全国卷文科数学试题吉林省辽源市第五中学校2022-2023学年高二上学期期末数学试题(已下线)广东省深圳市高级中学(集团)2023届高三上学期期末数学试题变式题17-22(已下线)湖南省怀化市2022-2023学年高三上学期期末数学试题变式题17-22山西省晋中市晋中新格伦双语学校等2校2022-2023学年高三上学期12月月考文数试题江西省宜春市丰城第九中学2023届高三下学期重点班开学质量检测数学(文)试题上海市七宝中学2023-2024学年高二上学期期中数学试题
名校
解题方法
8 . 已知数列
满足:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06c14cb5b3224c917e8f30961803518.png)
(1)证明:数列
是等差数列;
(2)求数列
的前
项的和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06c14cb5b3224c917e8f30961803518.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e1c06829bf8a351bf0d2d29d2889f1.png)
(2)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)
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4卷引用:云南省楚雄市实验中学2023届高三上学期第三次测试数学试题
名校
解题方法
9 . 已知数列
满足:
,
.
(1)证明:
为等差数列,并求
的通项公式;
(2)数列
,求满足
的最大正整数n.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255d32abc2a599f2edca1ae8ba2e1077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c185c9d41cb3214a88038fd1e3eb0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f83f585c9b92395c1e7844261f524b.png)
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2022-11-16更新
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3卷引用:云南省云南师范大学附属中学2023届高考适应性月考卷(五)数学试题
解题方法
10 . 设数列
的前n项和为
,且
,数列
满足
,且
.
(1)证明:数列
是等比数列,数列
是等差数列,并求
,
的通项公式;
(2)设数列
的前n项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105738c5cd57c047ba1145c6cb0943e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13620d6f9b951b7d6c5964d3b7b7593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf620ae89341be941bb58e603ef1859.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d84169a989e2461c0d904e93c481ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9c4bad4ee631eb6ed6798b22f969f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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