名校
1 . 已知等差数列
的前
项和为
,且
,
.
(Ⅰ)求
及
;
(Ⅱ)令
,求证:数列
为等差数列
![](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/f6278d3cc0086c7aab6ac20712c7d0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbcd66661bbf309a42b56bee0c89d21.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(Ⅱ)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d269e8648a4d3f6e3b09963ef9cd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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2018-08-22更新
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2卷引用:福建省宁德第一中学2021-2022学年高二上学期开学考试数学试题