1 . 在等差数列
中,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c47da2d995b1b0e608fc1a06b8c61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
A.3 | B.6 | C.4 | D.12 |
您最近一年使用:0次
2020-05-25更新
|
338次组卷
|
3卷引用:西藏拉萨那曲第二高级中学2020-2021学年高二上学期期中考试数学试题
名校
2 . 等差数列
中,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6278d3cc0086c7aab6ac20712c7d0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b58721c6afd701af600bb554d8a0b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
A.16 | B.17 | C.18 | D.19 |
您最近一年使用:0次
2019-04-27更新
|
1570次组卷
|
3卷引用:西藏自治区拉萨市拉萨那曲第二高级中学2019-2020学年高二上学期期中数学试题