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追答带括号的表示的是集合,不带括号只有一个数的表示元素
是不一样的
元素和集合之间用∈,集合和集合之间用我给图里给你写的符号
具体做法我给你发图了
望采纳
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追答把书再往下看,就是你那页的最底下
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你怎么不往下再看呢
追问谢谢啊
你数学应该很好
追答。。。希望采纳
平时没事也就做做题。。。
追问A∩B∩C=∅
追答然后呢
这个是这么理解,这是三者相交,也就是三者都有的元素组成的集合,举个例子A=(1.2.4),B=(2.3.5).C=(24.6).那么三者相交集合是(2),这个是三个一起看,不是两个两个看的
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