名校
解题方法
1 . 记
为等差数列
的前n项和,若
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e03a94c38b1d10d6dcd9d6eb9e3e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-03-05更新
|
772次组卷
|
4卷引用:江苏省镇江市2021-2022学年高二下学期期初考试数学试题
名校
解题方法
2 . 在等差数列
中,若
,
则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f86a8746a583f411fb73c6334eb27b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304b18b2bd783d82ec007732c6b69293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554e6c461ccc5aa3093c524aa528a4e2.png)
A.68 | B.78 | C.156 | D.136 |
您最近一年使用:0次
2022-03-05更新
|
725次组卷
|
2卷引用:江苏省扬州市2021-2022学年高二下学期期初调研测试数学试题