GRE数学机经最新预测整理

2022-05-31 05:06:30

  

  题目

  1. n is a positive integer, x = 7*n + 2, and y = 6*n + 3

  Quantity A:the ones digit of x+y

  Quantity B:5

  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.

  正确答案

  D

  题目解析

  题目问的是x+y的个位数和5相比,哪个大? x+y=7n+2+6n+3=13n+5

  题目中只提供了n>0且n为整数,所以13n+5的个位数有可能是0~9中除5以外的任何一个,故无法判断13n+5的个位数与5相比哪个大。

  注意:题目不是问(x+y)与5相比谁大

  2. During an experiment, the pressure of a fixed mass of gas increased from 40 pounds per square inch (psi) to 50 psi. Throughout the experiment, the pressure, P psi, and the volume, V cubic inches, of the gas varied in such a way that the value of the product PV was constant.

  Quantity A:the volume of the gas when the pressure was 40 psi

  Quantity B:1.2times the volume of the gas when the pressure was 50 psi

  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.

  正确答案

  A

  题目解析

  题目的意思是:气体是同样的气体,只是比较在不同压强下的体积大小。

  P·V是定量(假设为单位1),压强越大,体积越小。

  公式应该用体积正比于质量/压强,因此假设40psi,就当作是1/40,A就是1/40;假如50psi,就当作是1/50,B是1.2倍,所以是1.2/50,因此答案是A

  For the large cars sold at an auction that is summarized in the table above, what was the average sale price per car?

  正确答案

  6000

  题目解析

  问的是拍卖会卖掉的大车的平均售价,实际销售额是120000,卖掉20辆,因此每辆价格是6000美元。

  4. Rectangle R has length 30 and width 10, and square S has length 5. The perimeter of S is what fraction of the perimeter of R ? _____/_____

  正确答案

  20,80

  题目解析

  本题告知两个四边形周长,求比值,长方形周长为(30+10)*2=80,正方形周长为5*4=20,因此分别填入20和80即可。

  本题看似简单,然而在官方统计数据中正确率非常低,原因在于许多考生自动将答案约分成了1,4。这里特别提醒大家GRE考试并不需要大家做多余的计算步骤,因此在题目没有要求的情况下请直接填写原本数值,不要做其它计算工作。

  5. A certain jar contains 60 jelly beans—22 white, 18 green, 11 yellow, 5 red, and 4 purple. If a jelly bean is to be chosen at random, what is the probability that the jelly bean will be neither red nor purple?

  A. 0.09

  B. 0.15

  C. 0.54

  D. 0.85

  E. 0.81

  正确答案

  D

  题目解析

  概率题,60个糖豆,随机拿一个,求拿不到红色和紫色的概率,红色和紫色一共有9个,反过来就是51/60的概率抽不到,最后结果为0.85,选D。

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