名校
解题方法
1 . 设数列
的前n项和为
;正项数列
的前n项和为
,且
(
且
).
(1)求
的通项公式;
(2)证明数列
为等差数列;
(3)在数列
的
和
项之间插入k个数,使这
个数成等差数列,其中
,将所有插入的数组成新数列
,设
为数列
的前n项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29b48f9ddb4fb346c34efd6bba2b00.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/416d8560ac056146a73c72f1e161a8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e1397310241941a209eb0685efb1dc.png)
(3)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217b927efe12a98e1082ecd7f035b921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4792fd59c4ca11ff03dc32e367c3983f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7304f4a3860fb2ce6535b51166d21446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be5870ecece973331fef2fc7844502.png)
您最近一年使用:0次
名校
解题方法
2 . 已知数列
的前
项和为
,且
.
(1)证明:数列
是等差数列;
(2)已知
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.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/50032d99f9337c30026807d043eb4c59.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd2f53f12e6a5b8d59190d5c79586b2.png)
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2024-02-28更新
|
626次组卷
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3卷引用:黑龙江省伊春市铁力市第一中学校2023-2024学年高二下学期期中考试数学试卷
黑龙江省伊春市铁力市第一中学校2023-2024学年高二下学期期中考试数学试卷河南省新高中创新联盟TOP二十名校2023-2024学年高二下学期2月调研考试数学试题(已下线)5.3.2 等比数列的前n项和(3知识点+8题型+强化训练)-【帮课堂】2023-2024学年高二数学同步学与练(人教B版2019选择性必修第三册)
3 . 已知在数列
中,
.
(1)令
,证明:数列
是等比数列;
(2)设
,证明:数列
是等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987d1b177484459cd91492011a5062ad.png)
(1)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29f8e71940ac057050d3f26595c1513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2a57b0eaab31c7674818f19f5cad5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3349b5c0ffdf7137b35512d54378d2.png)
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4 . 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
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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
5 . 已知数列
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029c14bddad6c0ecb023738d05bac070.png)
(1)求证:数列
是等差数列,并求出
的通项公式;
(2)设
,求数列
的前n项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029c14bddad6c0ecb023738d05bac070.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099a64d86bd0b4602578d910322adc1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a17e053dee2f2b6831f09880b6728ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2023-11-30更新
|
1488次组卷
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4卷引用:黑龙江省哈尔滨市哈师大附中2024届高三上学期期中数学试题
黑龙江省哈尔滨市哈师大附中2024届高三上学期期中数学试题四川省眉山市仁寿第一中学校南校区2024届高三上学期12月月考数学(文)试题四川省眉山市仁寿第一中学校南校区2024届高三上学期12月月考数学(理)试题(已下线)专题06 等差数列及其前n项和8种常见考法归类(1)
6 . 已知数列
满足
,
.
(1)设
,证明:
是等差数列;
(2)设数列
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c52909d5e77f7a581509556365cffaf.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5fc0b571e6545e133d36af338733b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.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/08eb71ecf8d733b6932f4680874dbbf3.png)
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2023-11-07更新
|
2097次组卷
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3卷引用:黑龙江省大庆市肇州县第二中学2023-2024学年高三上学期11月月考数学试题
7 . 已知数列
的前n项和为
,且
.
(1)证明:
是等差数列;
(2)对任意正整数n,都有
,且存在常数m,使得
为定值t,求
的值.
![](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/73c2a3ac4693f3ec59776987cb84acae.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db11ed857c057f56c627b688938aae0d.png)
(2)对任意正整数n,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050870cfd70ee75381bb82eab1d26cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6ae1a92029acfbc7e7f6eb92cd1a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bdb686910f213670f2c6f9e46c1f62.png)
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名校
解题方法
8 . 已知正项数列
的前
项和为
,且
.
(1)求
;
(2)设
,数列
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/ae734ad099abbb2f7efe7d7a6a4169fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58693764692ff0194a846f842b780274.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ec386f0f3ddad65efa9fac2d5bc5d0.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/60f64ba0d54562f1116d869910490ccb.png)
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2023-10-22更新
|
3634次组卷
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8卷引用:黑龙江省牡丹江市第二高级中学2023-2024学年高三上学期第四次阶段考试数学试题
黑龙江省牡丹江市第二高级中学2023-2024学年高三上学期第四次阶段考试数学试题贵州省天柱民族中学2024届高三上学期第三次月考数学试题(已下线)第五章 数 列 专题3 数列中的不等式能成立证明云南省曲靖市第一中学2024届高三上学期阶段性检测(四)数学试题云南省开远市第一中学校2023-2024学年高二上学期期中数学试题(已下线)专题08 数列(5大易错点分析+解题模板+举一反三+易错题通关)(已下线)第06讲 拓展一:数列求通项(7类热点题型讲练)-【帮课堂】2023-2024学年高二数学同步学与练(人教A版2019选择性必修第二册)(已下线)专题10 数列不等式的放缩问题 (练习)
名校
解题方法
9 . 记
为数列
的前n项和,已知
.
(1)证明:数列
是等差数列;
(2)设k为实数,且对任意
,总有
,求k的最小值.
![](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/b2e6a70d0cbf3accc905e04a7610b638.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
(2)设k为实数,且对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f80b250d08ab725f70c7c3047737fe.png)
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2023-09-16更新
|
866次组卷
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3卷引用:黑龙江省哈尔滨市第一二二中学校2023-2024学年高三上学期10月月考数学试题
名校
10 . (1)已知数列
满足
,
.求证:数列
是等差数列;
(2)设数列
为等差数列,
,
,判断55是否是数列中的项,若是,是第几项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15ffa7fecea3704dc892ea8cd513c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d461ba67102bff39822aa04189928eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7abe2dbf91b745e81aa97bee35b0bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42768e1e736e7ec970b5a441e5177d9e.png)
您最近一年使用:0次