某班有学生45人,其中体育爱好者33人,音乐爱好者24人,还有4人既不爱好体育也不爱好音乐,则该班既爱好体育又爱好音乐的人数为_____ .
更新时间:2020-11-20 13:11:38
|
【知识点】 容斥原理的应用
相似题推荐
填空题-单空题
|
较易
(0.85)
名校
【推荐1】有限集合
中的元素个数记作
,设
都为有限集合,则易知:
(1)
.
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8d57cb19078c2268a06f6bdf73f805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b82eba2e437c25fa05913ccbc2d8474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87d55a412b5418ef2f87e8f9dad5662.png)
问(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0580398bb9f6945d7ac664fb5ecb0180.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0496011eda2d13aeb76196b2068e104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9eeaf7014c46d9cf4ebac51c3e25d85.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8d57cb19078c2268a06f6bdf73f805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b82eba2e437c25fa05913ccbc2d8474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87d55a412b5418ef2f87e8f9dad5662.png)
问(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0580398bb9f6945d7ac664fb5ecb0180.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
名校
【推荐2】某班45名学生中,有围棋爱好者22人,足球爱好者30人,同时爱好这两项的人最少有______ 人.
您最近一年使用:0次