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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