GRE数学真题解析
2017-05-27 | 阅1031
来源：十成托福 | 类型： GRE资讯
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在留学热潮中，GER作为申请美国研究生的必要条件之一，有越越多的人参加到这个庞大的GRE考试队伍中，常常导致考位供不应求。很多新手考生可能缺乏临场经验，但如果有正确的资料相助，也是能够取得理想成绩的。今天十成代报小编为大家带来了GRE数学真题解析，希望能够在复习中帮助到大家。
1. If a truck is traveling at a constant rate of 90kilometers per hour, how many seconds will it take the truck to travel a distance of 600 meters? (1 kilometer = 1000 meters)
??A. 18
??B. 24
??C. 30
??D. 36
??E. 48
??答案：B
??解析：题干时速90公里的卡车需要多少秒通过600米的距离。首先换算时速90公里，90,000米/(60*60)秒=25米/秒，所以时间=距离/速度=600/25=24秒。
??2. If the areas of the 4 squares are 50, 32, 18 and 12, what is the ratio of the small shaded portion to the area of the large shaded portion?(Note: Figure not drawn to scale)
A. 1:8
?B. 1:6
?C. 1:4
?D. 1:3
?E. 1:1
??答案：D
??解析：题干问小的黑色阴影面积/大的黑色阴影面积等于多少。小的黑色阴影面积=18-12=6，大的黑色阴影面积=50-32=18，所以小的黑色阴影面积/大的黑色阴影面积=6/18=1:3
??3. AB is the diameter of the circle. If AF=BF= 3√2，and AC=5, what is the area of square BCDE?
答案：11
??解析：题干求正方形BCDE的面积，根据AF=BF=3 ，三角形ABF为直角三角形，得出AB=6。根据AC=5，三角形ABC为直角三角形，得出BC2=AB2-AC2=62-52=11。正方形BCDE的面积=BC2=11
??4. In a group of 45 children, 60 percent of the children are boys, and 60 percent of the children are left-handed.
??Column A：Number of boys who are left-handed
??Column B：8
??A. The quantity in Column A is greater
??B. The quantity in Column B is greater
??C. The two quantities are equal
??D. The relationship cannot be determined from the information given
??答案：A
??解析：男孩的数量为45*60%=27, 用左手的人所占的百分比为60%, 所以用左手的男孩为27*60%=16.2. 而B是8. 所以A更大，所以选A.
??5. X = sum of the first 31 positive odd integers
??Y = sum of the first 30 positive even integers
??Column A：X - Y
??Column B：30
??A. The quantity in Column A is greater
??B. The quantity in Column B is greater
??C. The two quantities are equal
??D. The relationship cannot be determined from the information given
??答案：B
??解析：已知公式，和=[(首项+末项)*项数]/2. 项数= [(末项-首项)/公差]+1
??X=1+3+5+7+…+31=(1+31)*16/2=256
??Y=2+4+6+8+…+30=(2+30)*15/2=240
??所以X-Y=256-240=16. 比30小，所以选B.
