设等比数列
的前n项和为
,若
,则数列
的前100项和为( )
![](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/cddbe3254149affeb78f1a8e480cda2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92933a59f67d2ead354ee73897b56779.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-02-25 19:45:32
|
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】已知等比数列
的前
项和
,满足
,则
( )
![](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/0bb798f644805e5386617b3b11aab05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
A.16 | B.32 | C.81 | D.243 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】等比数列{an}的前n项和Sn=a•2n+1(n∈N*),其中a是常数,则a=( )
A.![]() | B.![]() | C.1 | D.2 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】在等差数列
中,
,则数列
的前
项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e207aa417e228410851a5c24314ea175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20673fc3c42dbb96a876ba92197fd8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
【推荐2】设[x]表示不超过x的最大整数,如[-3.14]=-4,[3.14]=3.已知数列{an}满足:a1=1,an+1=an+n+1(n∈N*),则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d278c175bb4f4098a6ea6885ea62bd9.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次