名校
1 . 已知等差数列
前n项和为
,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d9a6092341b5e9a657bbc153948149.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7dccc8cf983099a6fb7286a5d630b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d9a6092341b5e9a657bbc153948149.png)
您最近一年使用:0次
2 . 已知数列
的通项公式
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb23c6a9e8a42faef0a84be8ad6b008.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f448cebfaf66b70a4c8485bde0398d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb23c6a9e8a42faef0a84be8ad6b008.png)
您最近一年使用:0次
2019-07-09更新
|
810次组卷
|
2卷引用:四川省攀枝花市2018-2019学年高一下学期期末数学试题
3 . 等差数列
的第10项为23,第25项为-22,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b74f28bbfb842f6493845ad15840eb.png)
您最近一年使用:0次
4 . 在数列
中,
,
,且
(
),则
的值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329785900390130a04a57d0b55aaa569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f86a8746a583f411fb73c6334eb27b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa635d4ae41a0f7861d305b55bc618f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133d021459e80aa19df293027610441e.png)
您最近一年使用:0次
2017-11-27更新
|
702次组卷
|
2卷引用:河南省豫北豫南名校2018届高三上学期精英联赛数学(理)试题