解题方法
1 . 已知等差数列
的前
项和为
且
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)设
,求数列
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7a9511c3d1b6d41d17df1559919880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e171b2495433366d4eb72123531c25d1.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa3120ddb30d09eeaa089a3b38986fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2020-05-20更新
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7卷引用:数学-6月大数据精选模拟卷04(海南卷)(满分冲刺篇)