1 . 已知等差数列
的首项为
,公差为
,前
项和为
,若
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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/d03cb978ad8081c5bb6c9cd21a6a333a.png)
A.当![]() |
B.使得![]() ![]() |
C.![]() |
D.![]() ![]() |
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2 . 设为
等差数列
的前n项和,已知
、
、
成等比数列,
,当
取得最大值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ .
![](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/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d85252ec30a427151f300503e3024d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2297a9ddfd3d681025c3dc5a93d6751f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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解题方法
3 . 已知数列
不是常数列,前
项和为
,且
.若对任意正整数
,存在正整数
,使得
,则称
是“可控数列”.现给出两个命题:①存在等差数列
是“可控数列”;②存在等比数列
是“可控数列”.则下列判断正确的是( )
![](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/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec813921f5c8816d437808a5f7b5abb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.①与②均为真命题 | B.①与②均为假命题 |
C.①为真命题,②为假命题 | D.①为假命题,②为真命题 |
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4 . 设无穷数列
的前
项和为
,且
,若存在
,使
成立,则( )
![](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/661eb98b215405edbdc6434ce55b89cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699dfd96d64e59252e384847629c7a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4208fc3a5068fad9bcd233cca865c2fe.png)
A.![]() |
B.![]() |
C.不等式![]() ![]() |
D.对任意给定的实数![]() ![]() ![]() ![]() |
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5 . 已知数列
是公差为
的等差数列,若它的前
项的和
,则下列结论正确的是( )
![](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/5596e3d616cd804ad9a29a98b720831d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079f16bbd0704ecb6e5e44c5725af1d9.png)
A.若![]() ![]() ![]() ![]() |
B.![]() ![]() |
C.![]() |
D.![]() |
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2024-06-08更新
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341次组卷
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2卷引用:河北省衡水市2024届高三下学期大数据应用调研联合测评( VIII)数学试题
名校
解题方法
6 . 已知
为等差数列
的前
项和,
,
,则
的最小值为( )
![](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/062e951c4c1f95dd60f02b824edb3850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcadb164c09c38d877a500d0629b760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-05-14更新
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1318次组卷
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4卷引用:山东省泰安市2024届高三下学期高考模拟((三模))数学试题
2024·全国·模拟预测
解题方法
7 . 记等差数列
的前
项和为
,公差为
,已知
,则
取最小值时,
( )
![](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/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ddfc997dd316f8dd5ace14eda5626c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.1 | B.4 | C.5 | D.4或5 |
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8 . 设
是等差数列,
是其前n项的和.且
,
,则下面结论正确的是( )
![](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/c6482af8b5db7100cfc13d139856b364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c347e12907c6ddb9d417648c3ba81ba5.png)
A.![]() | B.![]() |
C.![]() ![]() ![]() | D.满足![]() |
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2024-04-19更新
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1269次组卷
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3卷引用:辽宁省部分学校2024届高三第二次联考(二模)数学试题
辽宁省部分学校2024届高三第二次联考(二模)数学试题安徽省六安市金寨县青山中学2023-2024学年高二下学期期中考试数学试题(已下线)专题06 等差数列与等比数列常考题型归类--高二期末考点大串讲(人教B版2019选择性必修第三册)
9 . 已知各项均不为0的数列
的前
项和为
,且
.
(1)求
的通项公式;
(2)若对于任意
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/fbe5f17153195f4056b41595db85e363.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938b56f9979f9d70ce04a5ddb7979fc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2024-03-13更新
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10卷引用:湖北省七市州2024届高三下学期3月联合统一调研测试数学试题
湖北省七市州2024届高三下学期3月联合统一调研测试数学试题山东省潍坊市昌乐北大公学学校2024届高三下学期3月监测数学试题江西省南昌市第十九中学2023-2024学年高三下学期第一次模拟考试数学试卷(已下线)湖北省七市州2024届高三下学期3月联合统一调研测试数学试题变式题16-19甘肃省兰州市2024届高三下学期三模数学试题江苏省连云港市东海高级中学2023-2024学年高二下学期第一次月考数学试卷江西省丰城市第九中学2023-2024学年高二下学期4月月考数学试题重庆市乌江新高考协作体2023-2024学年高二下学期第一阶段学业质量联合调研抽测(4月)数学试题辽宁省大连育明高级中学2023-2024学年高二下学期期中考试数学试卷(已下线)4.2.2等差数列的前n项和公式(3)
名校
10 . 若有穷数列
(
是正整数),满足
,
,…,
即
(
是正整数,且
),就称该数列为“对称数列”.
(1)已知数列
是项数为8的对称数列,且
,
,
,
成等差数列,
,
,试写出
的每一项.
(2)已知
是项数为
(其中
,且
)的对称数列,且
构成首项为
,公差为
的等差数列,数列
的前
项和为
,则当
为何值时,
取到最大值?最大值为多少?
(3)对于给定的正整数
,试写出所有项数为
的对称数列,使得
成为数列中的连续项;当
时,并分别求出所有对称数列的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8642ca67abb1197f8747164bfaf89ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd94aeeecf0123921d4aef51c5defcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341bd4ff68347b38c8e3f9e5a3b665dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692f0652866d5e18fa597d40bfc3cac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22fc26a14e8e5987688565881fb71e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef835c9ad2636a9662fb6c99e3abc78.png)
(1)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205134fd111bb82fa9b8ccc03c2125a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ab0309e2cd35585ea9fb2cc3017abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2397df3279607612ea3cbef101ee0bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232d1ce3ad14256b1543e6007ff1675d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccf4156e7d9b0c812624db1aac4c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ab0309e2cd35585ea9fb2cc3017abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5631bc01b998a4b3fabd9e131699dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1254067b56565394384de5be7b8f3ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1254067b56565394384de5be7b8f3ec1.png)
(3)对于给定的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee2717a9789206ede2ab8890452735a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498cad9463384816b646b706fdf6e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181e20b29f1d57e99c024ddffce7a41b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e54b826a33eff66e09fe70e4ff48b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e8936c9fe1e81726455908657a29fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addee6ce5163a2580888ce2da22714af.png)
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2024-03-13更新
|
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2卷引用:广东省广州市第六十五中学2024届高三下学期2月月考数学试题