已知等差数列
满足:
为数列
的前
项和,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd2b34dcad62440f7d30a44d3ad5e5b.png)
![](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/dc4e70b360f988fdbd92300ab22c4613.png)
A.18 | B.45 | C.90 | D.180 |
更新时间:2024-05-23 10:36:34
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【推荐1】已知等差数列
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【推荐1】已知等差数列
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解题方法
【推荐2】在等差数列
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