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集合关系的判定关键在于正确认识集合中元素的属性,故元素分析法系一种常用解法.笔者尝试了一种另类的分析方式,效果甚好.下面给出三例,供参考.
The key to determine the relationship between the collection is to correctly understand the attributes of the elements in the collection, so the element analysis method is a common solution .I tried another kind of analysis, the effect is very good. Here are three cases for reference.