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中国是由五十六个民族组成的大家庭;高一(3)班的全体同学;小于10的所有质数;到线段AB两端距离相等的所有点组成的图形.常言道:“物以类聚,人以群分.”其实,用数学的观点来看,这就是一种最朴素、最生活化的集合的概念.上
China is a large family of fifty-six ethnic groups; all classmates in class one (3); all prime numbers less than ten; and a figure consisting of all the points at the ends of line AB at equal distances. As the saying goes: People are divided into groups."Actually, from a mathematical point of view, this is a concept of the most simple and lifelike collection.