已知
为最接近
的整数,数列
满足
,则数列
的前110项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35614ae44163c495c9a85b2a58dcd662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d278d6ec729ca24df7fbe7a4306576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.15 | B.20 | C.40 | D.60 |
更新时间:2022-04-21 14:13:27
|
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【推荐1】已知数列
满足
,且
,数列
满足
,且
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐2】已知数列
的前
项和为
,
,当
时,
,则
等于( ).
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
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A.1008 | B.1009 | C.2016 | D.2017 |
您最近一年使用:0次
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适中
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解题方法
【推荐1】设Sn为等差数列{an}的前n项和,若a7=5,S5=-55,则nSn的最小值为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐2】等差数列
的首项
,它的前
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项的平均值
,则抽出的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dc759e6f45cff8dacef4206490e98a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
【推荐1】对任一实数列
,定义
,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1b87726fc455bda6b57a6bbf945370.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bc11d05aad76672e30e17311d204d5.png)
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A.1000 | B.2000 | C.2003 | D.4006 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】记数列
的前
项和为
,若存在实数
,使得对任意的
,都有
,则称数列
为“和有界数列”. 下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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