名校
解题方法
1 . 已知首项为1的数列
的前
项和为
,其中
,现有以下结论:①
;②
;③
.则正确结论的序号为( )
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de33eee3f30cd929620f7f52069c894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f801629bc14181f7e0cd2aa67c22b527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0eda61a7d9fc046aac897b6073c52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abf15ab668060c0fc89a73dbfd57d5f.png)
A.① | B.② | C.②③ | D.①②③ |
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