若数列
的通项公式是
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787dc178f54f7b53e67f952351423bb2.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1566227eba874651790d9e069169e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787dc178f54f7b53e67f952351423bb2.png)
更新时间:2023-10-10 22:59:41
|
【知识点】 分组(并项)法求和
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