解题方法
1 . 已知等差数列
的前n项和为
,且满足
,
,则下列选项正确的有( )
![](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/f4c152686fb59b137d549fff9e7c45d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf1ef7611706085aa5dc8ddba66eb40.png)
A.![]() | B.数列![]() |
C.当n=15时,![]() | D.![]() |
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2 . 已知等差数列
的公差d≠0,且
,
,
成等比数列,
的前n项和为
,
,设
,数列
的前n项和为
,
(1)求数列
的通项公式;
(2)若不等式
对一切
恒成立,求实数λ的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d04a8b7a7595251251b8e0b7e665e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34bc3df3bea2def2fd30b0f90d75ef32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666c4baf8ded0a8c4788b67f316e81f9.png)
![](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/24f39fbe22dd891ead500de7e77ab3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a11035037cfd4240c48bc89661374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e922c4273aaef507f569cf67ab3d6537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
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3 . 已知数列
的通项公式为
,在
与
中插入
个数,使这
个数组成一个公差为
的等差数列,记数列
的前
项和为
,
(1)求
的通项公式及
;
(2)设
,
为数列
的前
项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80c1ed7b10ac7ca1cd81cdd39a8fcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a2150c288b258addb66ae22ae818de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9acc937f669c8c7378303432f76aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e260b088f071983f254ce8f5163fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6469fad168bbcdf117f29fdbe26c51.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
昨日更新
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4卷引用:四川省泸州市龙马潭区2023-2024学年高二下学期6月期末考试数学试题
四川省泸州市龙马潭区2023-2024学年高二下学期6月期末考试数学试题江西省南昌市第十九中学2023-2024学年高二下学期5月期中考试数学试题湖北省武汉市第十一中学2023-2024学年高二下学期6月考数学试题(已下线)专题07 数列通项公式与数列求和--高二期末考点大串讲(人教B版2019选择性必修第三册)
解题方法
4 . 记
为等差数列
的前
项和,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8150f65410c124ec09b0b21f9f9cb71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d07286357b06a17772042c72b994d98.png)
A.2 | B.3 | C.10 | D.4 |
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5 . 若等比数列
的各项均为正数,且
成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f53b1caa283934f588df7c65d0794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d199ca00db1ece6be9e802a22dfc0f44.png)
A.3 | B.6 | C.9 | D.18 |
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6 . 已知数列
满足
,若
为数列
的前
项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8228283efaccfedc14911a97937fb8de.png)
_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70aa62d5dd947ec4d99ad3ef597937d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b6da7464d104521d6e068172f01504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70aa62d5dd947ec4d99ad3ef597937d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8228283efaccfedc14911a97937fb8de.png)
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解题方法
7 . 等差数列
的前
项和为
,则( )
![](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/89f4e49c1246e19192851f999946143f.png)
A.![]() | B.![]() |
C.![]() | D.当 ![]() ![]() |
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8 . 南宋数学家杨辉为我国古代数学研究作出了杰出贡献,他的著名研究成果 “杨辉三 角” 记录于其重要著作《详解九章算法》中, 该著作中的 “垛积术” 问题介绍了高 阶等差数列. 以高阶等差数列中的二阶等差数列为例,其特点是从数列中第二项开始,每一项与前一项的差构成等差数列. 若某个二阶等差数列
的前四项分别为:
,则下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e59eefa7d589908601bc0b2014acd74.png)
A.![]() | B.![]() |
C.数列 ![]() | D.数列 ![]() |
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9 . 已知等差数列
的公差为
,前
项和为
,且满足
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92a109f29f48ad436c42ecf39e94bd5.png)
成等比数列.
(1)求数列
的通项公式;
(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/90bfe21c96489cb30c544d49ddb4c1c8.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/8289b36f86525e58c3682ea08b2befb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92a109f29f48ad436c42ecf39e94bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
解题方法
10 . 已知等差数列
满足
,
为其前
项和,若
,
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4927f5e4c0004453b4071074b543fa71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10599e638e83e2b43b08315a7ba93517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655c46b33730f3a29b9ec3024df71375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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