GMAT考试GMAT数学XDF500题(PS部分)(解释完整版).pdf

GMAT 考试复习 GMAT 数学 XDF500 题（ PS部分） 1 A grocery store purchased crates of 40 oranges each for $5.00 per crate and then sold each orange for $0.20. What was the stores gross profit on each crate of oranges? (A) $3.00 (B) $6.00 (C) $8.00 (D) $10.00 (E) $13.00 答案 A 考点 收入 - 成本 =利润 难度 1 思路 总收入用 40 乘以 0.2 再减去进货成本 2 The product P of two prime numbers is between 9 and 55. If one of the prime numbers is greater than 2 but less than 6 and the other is greater than 13 but less than 25, then P = (A) 15 (B) 33 (C) 34 (D) 46 (E) 51 答案 E 考点 质数 因数 难度 1 思路 其中一个质数可以为 3 或 5 另一个为 17 19 或 23 计算出来 3 If , then m = (A) 17 (B) 18 (C) 34 (D) 35 (E) 36 答案 D 考点 指数运算 难度 2 思路 分母的数字分解质因数 找到 2 和 5 的指数对应 1 4 The value of is closest to which of the following? (A) 1 (B) 10 2 (C) 10 3 (D) 10 4 (E) 10 答案 B 考点 小数分数科学计数法 难度 1 思路 分子分母减号后面的数对于前面的数都可以忽略不计 5 For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100) + 1, then p is (A) between 2 and 10 (B) between 10 and 20 (C) between 20 and 30 (D) between 30 and 40 (E) greater than 40 答案 E 考点 定义新运算 质数 因数 难度 4 思路 h(100) 可以被 2— 50 任何数整除 那么加 1 之后不能被 2— 50 任何数整除 2 6 A flower arrangement consists of 30 roses, each of which is either white or red. If a rose is to be selected at random from the flower arrangement, the probability that the rose selected will be white is twice the probability that it will be red. How many white roses are in the flower arrangement? (A) 5 (B) 10 (C) 15 (D) 20 (E) 25 答案 D 考点 概率 比例 难度 2