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目前,对于质数的定义往往有不同的叙述,颇值得我们小学数学教师推敲。概括起来,主要有以下几类定义。定义1 一个数除了1和它本身,不再有别的约数,这个数叫做质数(也叫做素数)。定义2 一个大于1的自然数,如果只有1和它本身两个约数,这个数就叫做质数。定义3 只有1和它本身两个约数的自然数,叫做质数。定义4 只有1和它本身两个约数的数,叫做质数。这些定义,究竟哪个好?小学数学课本中采用的是定义1,它是通过观察几个数的约数之后归纳
At present, the definition of prime numbers often have different narratives, rather worthy of our primary school mathematics teachers scrutiny. To sum up, there are mainly the following types of definitions. Definition 1 A number other than 1 and itself has no other divisors. This number is called a prime number (also called a prime number). Definition 2 A natural number greater than 1, if only 1 and itself two divisors, this number is called the prime number. Define a natural number of only 1 and its two divisors, called prime. Definition 4 Only 1 and itself two divisor number, called the prime number. These definitions, what is good? Primary mathematics textbook is used in the definition of 1, it is through the observation of a few numbers after the sum of the approximation