名校
1 . 已知数列
的前n项之和
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa32da22dc11658e01ffbea7322ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9909fd31747655ed87b5e0a6a582b0c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.61 | B.65 | C.67 | D.68 |
您最近一年使用:0次
2018-12-17更新
|
1845次组卷
|
6卷引用:河南省济源市第六中学2023-2024学年高二上学期10月月考数学试题
名校
2 . 数列
的前
项和为
,若
, 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/a12945873f31f87827ac5c317376ee73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-07-03更新
|
1542次组卷
|
6卷引用:河南省济源市第四中学2023-2024学年高二上学期11月月考数学试卷