1 . 已知
.
(1)当
时,求
的展开式中含
项的系数;
(2)证明:
的展开式中含
项的系数为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a28a05784f40d06bc0e7dd51603e14.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d800f03de80068a1172beac3a2c75587.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e26f2235031a8d214d82a5e405db676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f491e0ec6cfcb294892cfb37270e5d92.png)
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2020-04-25更新
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4卷引用:山西省临汾市浮山中学校2023-2024学年高二下学期第一次月考数学试卷(A)