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判断下列关系式是否成立[高中数学必修1集合问题]下列关系式成立吗?(1)A并A=A(2)A并空集=A（3）A交A=A（4）A交空集=A
判断下列关系式是否成立
[高中数学必修1集合问题]下列关系式成立吗?
(1)A并A=A
(2)A并空集=A
（3）A交A=A
（4）A交空集=A
1回答
2020-02-02 22:58
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李天峻
第4个不成立,应该是A交空集＝空集
其他都成立
2020-02-02 23:02:00
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