GMAT數學相對是比較簡單的,但是也是比較容易出錯的,因此南京GMAT講師介紹,GMAT數學要想分不拖后腿,一定要證拿到基礎分,只有打好基礎才能有可能,千萬不能忽視基礎,下面我們一起來看看吧! 一.整數:integer,whole number 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 multiple n.倍數 2.商和余數:quotients and remainders 余數和商都可以為0 3.奇數和偶數:odd and even integers 奇數和偶數都可以是負數;零一定是偶數 4.質數和合數: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). 注:GMAT考試除了1和其本身外,還有其他因子的數叫合數。GMAT數學 小的質數為2, 小的合數為4,在討論質數和合數時,都指正數。1和0既不是質數,也不是合數。 5.整數中的重要概念: * Perfect square完全平方數,諸如9 = 32 * Perfect cube 完全立方數,諸如8 = 23 * the greatest common divisor 大公約數 GMAT入門幾個數所公有的 大因子稱 大公約數,諸如:48與36的公因子有1,2,3,4,6,12,其中12為 大公約數。 * the least common multiple 小公倍數 幾個數所公有的 小倍數稱 小公倍數,諸如:3,7和14的 小公倍數為42。 *連續正整數的算術平均值也是首項和末項的算術平均值。 同理,連續奇數與連續偶數的算術平均值也是首項和末項的算術平均值。
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