已知等差数列
的前
项和为
(其中
),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/20b25961d651342dfdb2caa185598933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc47c1d9c11fdaf5a5cf2d6599042de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a95f0d6e0da1b14db6ab4b1ee0c630.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2023-05-17 21:55:08
|
【知识点】 等差数列前n项和的基本量计算
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【推荐1】已知递增等差数列{an},的前n项和为Sn,且a2+a4=8,a1a5=﹣20,则
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb59e92efca70f776fafc2e0fe649637.png)
A.10 | B.12 | C.28 | D.90 |
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