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两个、三个集合的并集中元素个数问题,在解决社会实际问题中经常用到.如何求两个、三个集合的并集中元素的个数?又如何解答社会实际问题中的相关问题呢?这正是我们所要探究的问题.
The number of elements in the union of two or three sets is often used to solve social practical problems. How to find the number of two or three sets of concentrating elements? How to solve the related problems in social practical problems? This is exactly what we want to explore.