已知
.
(1)求
和
的值;
(2)求式子
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4499a5ac5fa1bc18d44780cf90cb9a7f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
(2)求式子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c56a438d16b7b4a3dca1ea571268040.png)
更新时间:2020-02-07 22:33:46
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【知识点】 二项式定理与数列求和解读