1 . 已知
,二项式
展开式中含有
项的系数不大于240,记
的取值集合为
,则由集合
中元素构成的无重复数字的三位数共有__________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c38f3baf9a34265fbdb5c65dd1664d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b8688ed49e225da30ac7c51a40c21b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2020-05-12更新
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543次组卷
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3卷引用:2020届山东省青岛市高三4月统一质量检测(一模)数学试题