名校
1 . 已知数列
满足
若数列
为递增数列,则实数a的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d11f529e184db62b7fdf4f9bd3eaa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2022-04-04更新
|
583次组卷
|
3卷引用:河南省濮阳市第一高级中学2021-2022学年高二下学期期中考试数学(理)试题
名校
解题方法
2 . 已知{an}为递增数列,前n项和
,求实数λ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683afeb5cca92c4073afac933736ba2c.png)
您最近一年使用:0次
名校
3 . 已知等差数列
的通项公式
,记其前n项和为
,那么当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ 时,
取得最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a4609ef41f376855e8f05c7790b2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2023-08-15更新
|
274次组卷
|
4卷引用:河南省许昌市禹州市开元学校2022-2023学年高二下学期期中考试数学试题
4 . 已知数列
首项
,且满足
,令
.
(1)求证:数列
为等差数列;
(2)求数列
中的最小项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4995fa0403e013d888c0935ebfe15024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104b6a82bfe7c5fa2e97b37a7e49480d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac808e9663983353fba0b37afe1c4cb.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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名校
5 . 已知无穷项实数列
满足
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e076d53e0fab96afda46ff7ac1689dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ecf3a1fecf89a37a677393d0bfe27b9.png)
A.存在![]() ![]() | B.存在![]() ![]() |
C.存在![]() ![]() | D.至多有2047个不同的t,使得![]() |
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2022-03-24更新
|
555次组卷
|
2卷引用:河南省2021-2022学年高二下学期联考(二)理科数学试题
名校
解题方法
6 . 已知数列
的前
项和为
.
(1)求证:数列
是等差数列;
(2)若对任意正整数
,不等式
恒成立,求满足条件的最小整数
的值.
![](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/851afb5fa82c3e4448ac7b674d143cdf.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
(2)若对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdca4529a79b9dcfe3da53cd6171e869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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2022-05-09更新
|
531次组卷
|
3卷引用:河南省南阳市第一中学校2022-2023学年高二下学期第一次月考数学试题
解题方法
7 . 已知数列
满足
.
(1)求
的值;
(2)已知
是公比q大于1的等比数列,且
,
,设
,若
是递减数列,求实数λ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107cb87a3f3844640e9108b7efa450a5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)已知
![](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/02b25850823f9366760bbb8326b134e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc74228225645e8e9fec0c585a25eaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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8 . 已知数列满足
,则下列说法正确的是( )
A.当![]() ![]() | B.当![]() ![]() |
C.当![]() ![]() | D.当![]() ![]() |
您最近一年使用:0次
名校
解题方法
9 . 设数列
的前n项和为
,
.
(1)求数列
的通项公式;
(2)令
,数列
的前
项和为
,若对任意的正整数
,恒有
,求实数
的取值范围.
![](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/526fe808c8626c01a1e3155d812528c9.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f583e98ce6c526fbbf9d96dc2c3798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea780e427a9f9179c575ebf509f91845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2020-12-02更新
|
1058次组卷
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6卷引用:河南省实验中学2021-2022学年高二上学期期中考试数学(理)试题
10 . 等比数列
中,公比为q,首项为
,则“对任意正整数n,都有
”是“
且
”的( )
![](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/d2798e1dcab1f7f0fe3b8a94b3cd6a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179513ce80436471efbe1d9b31735f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca664b1e82da6f50064a76fe118aa80.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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2022-02-22更新
|
491次组卷
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5卷引用:河南省焦作市第四中学2022-2023学年高二下学期3月月考数学试题