2019年11月11日是石室中学
周年校庆日,学校数学爱好者社团组织“解题迎校庆,我爱
”的活动.其中一题如下:已知数列
,其中第一项是
,接下来的两项是
,
,再接下来的三项是
,
,
,依此类推.若该数列前
项和为
,则求满足
,且
是
的倍数条件的整数
的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe75dba0602f1eab440d012d899b712e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe75dba0602f1eab440d012d899b712e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e936b771f31163e8c634395933da122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad4668cc927e277289b2af718f0d91.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/b5c457cad8554e48fa442c6cc1e81825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
A.10 | B.12 | C.21 | D.60 |
更新时间:2019-09-26 19:17:30
|
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名校
解题方法
【推荐1】已知数列
满足
,且
,若使不等式
成立的
有且只有三项,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c492ef0c41f7a2f4c15fb27df44a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64174dea987ddd73fa4b73830e68a9f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5bb5c64be2d5df6041b3acc26b9987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
困难
(0.15)
【推荐2】如图,一质点
从原点
出发沿向量
到达点
,再沿
轴正方向从点
前进
到达点
,再沿
的方向从点
前进
达到点
,再沿
轴正方向从点
前进
达到点
,
,这样无限前进下去,则质点
达到的点的坐标是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/aea82d26-ee01-4c63-97a5-c48565d33809.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429033fc78f59859f69857e171d7423a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366596137b12cbfe42c0e94fdf7ce6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99198f470bfb3066e5821184426ccc30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8c162ee7c75aa5f5cbd196b18cc239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee065106d26c2b0aba3fec48c4536f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f782d70309802445202487eee751cbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/aea82d26-ee01-4c63-97a5-c48565d33809.png?resizew=180)
A.![]() | B.![]() |
C.![]() | D.![]() |
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