In the elementary school and the junior high school,we have met some sets.For example: The set of natural numbers(自然数):0,1,2, 3,4,5……The set of prime numbers(质数):2,3,5,7, 11,13,15……The set of points which ha...In the elementary school and the junior high school,we have met some sets.For example: The set of natural numbers(自然数):0,1,2, 3,4,5……The set of prime numbers(质数):2,3,5,7, 11,13,15……The set of points which have same distance展开更多
文摘In the elementary school and the junior high school,we have met some sets.For example: The set of natural numbers(自然数):0,1,2, 3,4,5……The set of prime numbers(质数):2,3,5,7, 11,13,15……The set of points which have same distance