1 . 对于实数
,用
表示不超过
的最大整数,例如
,
,
,设x为正实数,若
为偶数,则称x为幸运数.在区间(0,1)中随机选取一个数,它是幸运数的概率为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dba82c9b34eaae7374d8f9bbb6abb141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9feb047004eb507de484a7f8c5b6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ba98f22c3380eeb7b9323fa487c7c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a30f271f7b5f08bd81cab2089bb4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfe4ffba1ab1f41d416362ee281ac10.png)
您最近一年使用:0次
2019-01-29更新
|
536次组卷
|
2卷引用:2018年全国高中数学联赛天津市预赛
2 . 设
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463dc05e972af78159f355d16a10ade6.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b9fafffd69b566792ee2c6d5a73f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463dc05e972af78159f355d16a10ade6.png)
您最近一年使用:0次