GMAT数学精解备考分享

　　小编为大家带来GMAT数学精解备考-算术概述(1)，希望对大家GMAT备考有所帮助。
　　1.因子：factor or divisor If x and y are integers and x≠0,x is a divisor (factor) of y provided that y=xn for some integer n. In this case y is also said to be divisible by x or to be a multiple of x. For example, 7 is a divisor or factor of 28 since 28=7 4, but 8 is not a divisor of 28 since there is no integer n such that 28=8n.Divisible adj.可以被整除的multiplen.倍数 2.商和余数：quotients and remainders

　　余数和商都可以为0 3.奇数和偶数：odd and even integers 奇数和偶数都可以是负数;零一定是偶数 4.质数和合数：prime numbers and composite numbers A prime number is a positive integer that has exactly two different positive divisors，1 and itself. For example, 2,3,5,7,11, and 13 are prime numbers, but 15 is not, since 15 has four different positive divisors, 1, 3, 5, and 15. The number 1 is not a prime number, since it has only one positive divisor. Every integer greater than 1 is either prime or can be uniquely expressed as a product of prime factors. For example, 14= (2) (7), 81= (3) (3) (3) (3), and 484= (2) (2) (11) (11).