1 . 已知
的展开式所有项中仅有第五项的二项式系数最大.
(1)求
的值;
(2)求展开式中
的系数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250c63451843d520f22a181218371990.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)求展开式中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
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2020-12-17更新
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256次组卷
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3卷引用:西藏拉萨那曲高级中学2020-2021学年高二下学期期中考试数学(理)试题
2 . (1)设复数
满足
,且
为纯虚数,求
;
(2)已知
的展开式中所有二项式系数之和为
,求展开式的常数项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70c2519610d6d1d6d0855b0f27dfc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c7899d615dde1faacdde99cbe1438c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcfebd9f5a57036e6df6b6e14865da3.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2528d5ce5ef103be9d578af43b0febfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332e71982612ea86c28b9f2054b1045c.png)
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