数的概念和特性
几个GRE最常用的概念:
偶数:能被2整除的整数;
奇数:不能被2整除的数;
质数:大于1的整数,除了1和它本身外,不能被其他正整数所整除的,称为质数。也叫素数;(学过数论的同学请注意,这里的质数概念不同于数论中的概念,GRE里的质数不包括负整数)
倒数:一个不为零的数为x,则它的倒数为1/x。
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