2017年8月25日GRE数学预测习题

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  2017年8月25日GRE数学预测习题

  题目

  1. The roots of the equation x^2 - x - 6 = 0 are

  A, 1 and - 5

  B. 2 and - 3

  C. 3 and - 2

  D. 5 and - 1

  E. none of the above

  答案:C

  解析:方程式可转变为(x-3)(x+2)=0, roots也就是方式的根即为3和-2。

  2. Quantity A:The least prime number greater than 24

  Quantity B:The greatest prime number less than 28

  A. Quantity A is greater.

  B. Quantity B is greater.

  C. The two quantities are equal.

  D. The relationship cannot be determined from the information given.

  答案:A

  解析:大于24的最小质数为29,而B的任何一个数字都小于28,因此选A。

  3. Quantity A:54% of 360

  Quantity B:150

  A. Quantity A is greater.

  B. Quantity B is greater.

  C. The two quantities are equal.

  D. The relationship cannot be determined from the information given.

  答案:A

  解析:无需具体计算A,大致计算360的50%为180大于B即可。

  4.

  Quantity A:PS

  Quantity B:SR

  A. Quantity A is greater.

  B. Quantity B is greater.

  C. The two quantities are equal.

  D. The relationship cannot be determined from the information given.

  答案:D

  解析:根据条件可知三角形为等腰三角形,但缺乏其它条件因此无法判断PS和SR的长度,无从比较,所以选D。

  5. A merchant made a profit of $5 on the sale of a sweater that cost the merchant $15. What is the profit expressed as a percent of the merchant’s cost? Give your answer to the nearest whole percent.

  答案:33%

  解析:卖了件cost15块的衣服,赚到了5元profit,求profit和cost的百分比,也就是5/15,因为要求整数,因此约等于33%

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