本文是智课网给同学们提供的2017年5月21日GRE数学机经预测，这些题目也是考试可能会出现的重点，包括其中的一些知识点，大家备考时也要注意分析和总结。想要获得更多GRE备考资料，请提供手机号来下载吧!

题目

1.

Quantity A: x

Quantity B: y

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：只从PQ=RT而不清楚QR的长度，是无法判断x和y度数大小的，因此选D。

2. Jim exercised last Monday at 6:00 in the evening and then exercised every thrid day after that. For example, after last Monday, he exercised the following Thursday and then the Sunday following that. How many days after last Monday will be the next Monday he exercises?

答案：21

解析：周一锻炼，之后每隔3天锻炼，问下次锻炼为周一时与第一次周一间隔多少天，穷举法1,4,7,3,6,2,5,1，当中间隔三周，因此为21天。

3. The population of Country X for 1980 was p. The population of Country X increased by 3.8 percent in each of the next two years.

Quantity A: The population of Country X for 1982.

Quantity B: 1.076p

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：Quantity A计算公式为 p(1+3.8%)^2, 得出结果约为1.077p，A大于B，所以选A。

4. If x < y, which of the following must be true?

A. 2x < y

B. 2x > y

C. x^2 < y^2

D. 2x-y < y

E. 2x-y < 2xy

答案：D

解析：D项可变形为2x < 2y, 即题干的x < y, 是唯一正确解，其它等式缺乏条件，无法成立。

5. 1/2 < r < 1

Quantity A: 2r

Quantity B: 1/r

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：如果r=2/3, 则A=4/3 B=1.5, AB。因此存在不同结果无法判断，所以选D。

本文的内容是2017年5月21日GRE数学机经预测，希望对大家后面备考会提供更多指导。