20-21高一·江苏·课后作业
1 . 判断下列集合是有限集还是无限集:
(1)
;
(2)
;
(3)
(A,B为平面上两个不同的定点,P为动点).
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a717d9391449bf17ce6512b818a63f9.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c854a8e90bd2538b987d6a9efbf5cb.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8813bcdc0d007a126267bbecc741d2.png)
您最近一年使用:0次
20-21高一·江苏·课后作业
2 . 有下列命题:①空集是任何集合的真子集;②设
,若
,则
;③
.其中,正确的有_________ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ad78dc8b8aed907b4fe9640c997454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0ac8b620b5eca9daa7276712935ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22111b1f07e7873e5a156d1937eaac27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c95f416a77a6fe60dee2f9db18fecc9.png)
您最近一年使用:0次