1 . 设
,则二项式
的展开式的常数项是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be157f3d274782140a3772081c2b5d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e9bb08d07a0a7c83a8d53cc5e23182.png)
A.-160 | B.-80 | C.80 | D.160 |
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2 . 已知
,
是虚数单位,
,
,求展开式中系数为正实数的项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8748ff5ca0bf7f2c3f8eaa5e2dfe5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
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