对于正整数
,设最接近
的正整数为
(如
,
),记
,从全体正整数中除去所有
,余下的正整数按从小到大的顺序排列得到数列
,则数列
的前5项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb334e165679c6cb500c994cffa47147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46752bd68b97f8cb69b26e14acdc468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
A.55 | B.65 | C.70 | D.75 |
更新时间:2022-02-18 22:05:44
|
【知识点】 数列新定义
相似题推荐
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适中
(0.65)
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解题方法
【推荐1】某软件研发公司对某软件进行升级,主要是对软件程序中的某序列
进行重新编辑,重新编辑后的新序列为
,它的第
项为
.若序列
的所有项都是2,且
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8b0dd5f57217d2de73c2187eeaea6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bac393f76e302d6420e6b4b380f4d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed9925a0e08120e9d2d7846cbc45bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be24da1c355cf0b9b8ccadaa68a6e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259b2e755105c0ee479eabf7265a76a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026f43a309494cfc6ecab796dcdb54e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】若数列
的前
项和
满足:对
都有
(为常数)成立,则称数列
为“和敛数列”,则数列
,
,
,
中是“和敛数列”的有( )
![](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/a5141a5b907f5ff11bbd7cacbd7b5db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5b4ccba7ec420b63bfc588f967dbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6125ad7676b33456e72d978bac0c1f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6705356e49b863bdd5601c6142bfa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e088b5c711b1808a0f955e25c94b38ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee3ccde88e20c8f507c6db01fe0e064.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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