# 新GRE数学真题(OG+机经)

1.y=2x2+7x – 3 x y

2. The figure above shows the graph of a function f, defined by f(x)=|2x|+4 for all numbers x. For which of the following functions g defined for all numbers x does the graph of g intersect the graph of f ? A g(x) x–2 B g(x) x 3 C g(x) 2x – 2 D g(x) 2x 3 E g(x) 3x – 2 3.Each employee of a certain company is in either Department X or Department Y, and there are more than twice as many employees in Department X as in Department Y. The average (arithmetic mean) salary is \$25,000 for the employees in Department X and is \$35,000 for the employees in Department Y. Which of the following amounts could be the average salary for all of the employees in the company? Indicate all such amounts. A \$26,000 B \$28,000 C \$29,000 D \$30,000 E \$31,000 F \$32,000 G \$34,000 4.Working alone at its constant rate, machine A produces k car parts in 10 minutes. Working alone at its constant rate, machine B produces k car parts

in 15 minutes. How many minutes does it take machines A and B, working simultaneously at their respective constant rates, to produce k car parts? ____________minutes

5. 1)If the dollar amount of sales at Store P was \$800,000 for 2006, what was the dollar amount of sales at that store for 2008 ? A \$727,200 B \$792,000 C \$800,000 D \$880,000 E \$968,000 2)At Store T, the dollar amount of sales for 2007 was what percent of the dollar amount of sales for 2008 ? Give your answer to the nearest 0.1 percent. ___________% 3)Which of the following statements must be true? Indicate all such statements. A For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores. B The dollar amount of sales at Store S for 2008 was 22 percent less than that for 2006. C The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006. 6.A certain store sells two types of pens: one type for \$2 per pen and the other type for \$3 per pen. If a customer can spend up to \$25 to buy pens at the store and there is no sales tax, what is the greatest number of pens the customer can buy? A9 B 10 C 11 D 12 E 20 7.A list of numbers has a mean of 8 and a standard deviation of 2.5. If x is a number in the list that is 2 standard deviations above the mean, what is the value of x ? x=______

8.Frequency Distribution for List X Number 1 2 3 5 Frequency 10 20 18 12 Frequency Distribution for List Y Number 6 7 8 9 Frequency 24 17 10 9 List X and list Y each contain 60 numbers. Frequency distributions for each list are given above. The average (arithmetic mean) of the numbers in list X is 2.7, and the average of the numbers in list Y is 7.1. List Z contains 120 numbers: the 60 numbers in list X and the 60 numbers in list Y. Quantity A Quantity B The average of the 120numbers in list Z The median of the 120 numbers in list Z 9.The figure above shows the graph of the function f in the xy-plane. What is the value of f ( f (–1)) ? A –2 B –1 C0 D1 E2 10.By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of solution S, then liquid A accounts for what percent of the weight of the resulting solution? A 10% B 13% C 15% D 19% E 26% 11.Of the 700 members of a certain organization, 120 are lawyers. Two members of the organization will be selected at random. Which of the following is closest to the probability that neither of the members selected will be a lawyer? A 0.5 B 0.6 C 0.7 D 0.8 E 0.9 12.Line k lies in the xy-plane. The x-intercept of line k is –4, and line k passes through the midpoint of the line segment whose endpoints are (2, 9) and (2, 0). What is the slope of line k ? Give your answer as a fraction._______

13. In the course of an experiment, 95 measurements were recorded, and all of the measurements were integers. The 95 measurements were then grouped into 7 measurement intervals. The graph above shows the frequency distribution of the 95 measurements by measurement interval. Quantity A Quantity B The average (arithmetic The median of the 95 mean) of the 95 measurements Measurements 14.The random variable X is normally distributed. The values 650 and 850 are at the 60th and 90th percentiles of the distribution of X, respectively. Quantity A Quantity B th The value at the 75 750 percentile of the distribution of X 15.If 1+x+x2+x3=60, then the average (arithmetic mean) of x, x2, x3, and x4 is equal to which of the following? A 12x B 15x C 20x D 30x E 60x

16. Parallelogram OPQR lies in the xy-plane, as shown in the figure above. The coordinates of point P are (2, 4) and the coordinates of point Q are (8, 6). What are the coordinates of point R ? A (3, 2) B (3, 3) C (4, 4) D (5, 2) E (6, 2) 17.Let S be the set of all positive integers n such that n2 is a multiple of both 24 and 108. Which of the following integers are divisors of every integer n in S ? Indicate all such integers. A 12 B 24 C 36 D 72 18.The range of the heights of the female students in a certain class is 13.2 inches, and the range of the heights of the male students in the class is 15.4inches. Which of the following statements individually provide(s) sufficient additional information to determine the range of the heights of all the students in the class? Indicate all such statements. A The tallest male student in the class is 5.8 inches taller than the tallest female student in the class. B The median height of the male students in the class is 1.1 inches greater than the median height of the female students in the class. C The average (arithmetic mean) height of the male students in the class is 4.6 inches greater than the average height of the female students in the class. 19.A random variable Y is normally distributed with a mean of 200 and a standard

deviation of 10. Quantity A Quantity B The probability of the event 1/6 that the value of Y is greater than 220 20.In a graduating class of 236 students, 142 took algebra and 121 took chemistry. What is the greatest possible number of students that could have taken both algebra and chemistry?__________students 21.The total amount that Mary paid for a book was equal to the price of the book plus a sales tax that was 4 percent of the price of the book. Mary paid for the book with a \$10 bill and received the correct change, which was less than \$3.00. Which of the following statements must be true? Indicate all such statements. A The price of the book was less than \$9.50. B The price of the book was greater than \$6.90. C The sales tax was less than \$0.45.

22.Which of the following statements individually provide(s) sufficient additional information to determine the area of triangle ABC above? Indicate all such statements. A DBC is an equilateral triangle. B ABD is an isosceles triangle. C The length of BC is equal to the length of AD. D The length of BC is 10. E The length of AD is 10 23.The fabric needed to make 3 curtains sells for \$8.00 per yard and can be purchased only by the full yard. If the length of fabric required for each curtain is 1.6 yards and all of the fabric is purchased as a single length, what is the total cost of the fabric that needs to be purchased for the 3 curtains? A \$40.00 B \$38.40 C \$24.00 D \$16.00 E \$12.80 24.The fabric needed to make 3 curtains sells for \$8.00 per yard and can be

purchased only by the full yard. If the length of fabric required for each curtain is 1.6 yards and all of the fabric is purchased as a single length, what is the total cost of the fabric that needs to be purchased for the 3 curtains? A \$40.00 B \$38.40 C \$24.00 D \$16.00 E \$12.80 25.In the xy-plane, the point with coordinates (–6, –7) is the center of circle C. The point with coordinates (–6, 5) lies inside C, and the point with coordinates (8, –7) lies outside C. If m is the radius of C and m is an integer, what is the value of m ? m =_____ 26.What is the least positive integer that is not a factor of 25! and is not a prime number? A 26 B 28 C 36 D 56 E 58 27If 1 is expressed as a terminating decimal, how many nonzero digits 1/[(211)(517)] will the decimal have? A One B Two C Four D Six E Eleven 28.Eight hundred insects were weighed, and the resulting measurements, in milligrams, are summarized in the boxplot below. (a) What are the range, the three quartiles, and the interquartile range of the measurements? (b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?

29.The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown. Suppose the heights of a population of 3,000 adult penguins are approximately normally distributed with a mean of 65 centimeters and a standard deviation of 5 centimeters. (a) Approximately how many of the adult penguins are between 65 centimeters and 75 centimeters tall? (b) If an adult penguin is chosen at random from the population, approximately what is the probability that the penguin’s height will be less than 60 centimeters? Give your answer to the nearest 0.05 机经题： 8月 5选1 1. 3 个数的平均数是 30，把这 3 个数翻倍之后也加在这个 list 中。问加进去后， 6 个数的平均数是多少。 2. 一个矩形里有个圆，圆外的面积涂阴影，圆面积是阴影面积的一半，求矩形 面积与圆面积的比例。 补充：好像还有个答案是（0，-50） 3. 哪个选项满足-f(x)=f(x)？ 然后给了一些函数表达式。爆简单吧~~ 4. 本金是 a（给了具体数的，忘了） ，单利，年利率 r%，一个月后利息是 a/100， 求 r。 5. 1-9 这 9 个整数中选 2 个，选中的都是 3 的倍数的概率。 6. x<0, 0<y<1,求带 x 和 y 的三个表达式的大小排序。 （特值法就好了） 7. 某次测验，70 分以上的有 75%，85 分以下的 60%，求 70 到 85 分的人占总数 的百分比（应该是 35%） 8. The average test score of 2 boys is 75 and that of 3 girls is 95. What is the total

average score of 5 people? 5 选多 1. 一串数的 range 极差） 21， （ 是 求这串数中最小、 最大值的可能组合。 (秒杀,right?) 2. 坐标系中的一个圆，半径为 50，圆心在原点，选哪些点在圆上。(30,40)OK, (14,48)OK, 还有个选项也是可以的，忘了 还有好多是跟在图表后出的，不好描述。。 。 3. ，好像是一个学校里有 3/8 是女生，有 1/50 是生物系学生，问该校可能有几 名学生。 （其实就是找能够 8 和 50 的公倍数） Questions 4 ~6 显示关于 Professor, assistant, researcher 的 salary 的柱状图。 4. What is the median salary of assistant? 我选择了 45-50 之间的值。 5. What percent of total salary of professor is more than 100? 我选择了 3%部分和 14%的和值 17% 6. If the average salary between 50~120 is x and that of more than 120 is y of professor, what is the total salary? (the percent of till 120 is 86%) 我选择 0.86x + 0.14y.

AB 值大小比较 (选项 A: A>B, B: B>A, C: A=B, D: 大小关系不确定) 1. 17 除以某个数余 2，这个数叫 A，B 是 4（我选 D，A 可以是 3 或 5） 2. y 方开根号=8， A=3^2y, B=3^(-2y) （选 D，y 可以是正负 8） 3.数列首项 a1 是(1-1/2^2)， an=(1-1/(n+1)^2)*前一项（算下来就是 a1=3/4, a2=8/9*3/4......) A 是 a5, B 是 1/2 （选 A，a5=7/12） 4. n/k = 3/7 Column A n/k + k/n 5. A line passes (4, 6), (-6, 5) Column A Column B Column B 1

The slope of the line A 6.

-1

2 <u < v < w < z and u, v, w, z are odd consecutive integers Column A The median of 5 integers 7. F(x) : 2x + 4y = 6 and G(x) : 4x + 2y = 10. F(x) and G(x) intersect at a point (a, b) Column A A 8. When 15 is divided by z, remainder is 2 Column A z Column B 3 Column B b Column B The range of 5 integers

9. In the figure above, This is regular hexagon Column A The length of AB Column B The length of CD

10.

Column A The sum of a + b +c

Column B 180°

11. 0 < x < 1 and n > 1 Column A n/x Column B N

12. The mean of 600 females is 80 and standard deviation is 5. 86 is kth percentile The mean of 400 males is 75 and standard deviation is 3. 81 is nth percentile Column A k Column B n

13.

In the figure above, the line passes (0, 0) (4, -4) Column A lal Column B lbl

14. x = y/2 Column A y + (x/2) 15. Column A (5n - 3)/3 Column B (5n - 1)/2 Column B 1.25y

16. 有一射击队，人数 600 人，对其射击结果打分，结果服从正态分布，得到算 数平均分为 84 分，标准方差为 5，假定分数大于 90 分的概率为 k%; 另一射击

5. Y = ?

6. The average of set A consisting 30 integers is 30. If the value of each components of set A is twice and appended to the original set A, what is the average of new set consisting 60 integers? 7. From 6 boys and 3 girls, 2 people are selected. What is the probability that two selected are girls? 8. 变化率最大的是？ 1990 A B C D E Questions 9 ~ 11 \$84 \$82 \$87 \$100 \$46 2000 \$90 \$88 \$80 \$90 \$50

A=4%, B=7%, C=8%, D=12%, E=23%, F = 46% (Total = 30 billion, *1 billion = 109) 9. What is the central angle of the potion 12%?

10. What amount of total is difference between B and D? (in billion) 11. What fraction of the others is E? 12. Which of followings is f(-x) = -f(x)? A) x3/(x2+1) B) x4 + x2 C) x2(x + x2)

D) x3(x2 + x)

13. If the value of a solution of 8x2+2x+k is 1/2, what is the other solution? 14. What is the median of 10, 10, 8, 8, 8, 12, 12? 15. 连续扔硬币六次，同一面不连续出现的概率有多少？ 16. 把圆形蛋糕分成 8 份时， 把 sector shape cake 的 central angle 设为 x，分成 12 份时 sector shape cake 的 central angle 设为 Y 时，x/y=? 17. The three vertexes of a rectangle are (0, 4), (0, -3), (7, -3), what is the perimeter of the rectangle? 18. Number Score 1 x 2 1 5 2 7 1 1 3 4 2

If the average score of 20 cards is 2, what is the value of x? 19. If x + y ≤ 11, what is the greatest value of x*y? (x and y are positive integers) 20. In a rectangle of which width and height is 10 and 12 each, a circle is located. If the diameter of the circle is 8, what is the area of the rectangle except the circle? 21. x and y are positive integers greater than 1. If 4x + 12y = 100 and x < y, what is the value of x? 22. one-fifth of 1% of x = ? (In terms of x) 9月 1. 六个连续的奇数（整数）相加，不可能得到以下哪个结果 2. 一个等腰直角三角形里面镶嵌一个正方形，图画的不好，差不多是这样，正 方形的底边是个三角形的斜边是重合，并且是斜边的 1/3。已知三角形面积是 r， 求 1 这个小三角面积 3. V1： 一个数把它的三角形向右移六次， 得到的数是原来这个数的倒数的九倍，

5. 给了一个表格，表示一二三四年级的人数，一个教授要建一个小组，从二三 四年级中各选相应的人数，用乘法计算就对了。 6. 一道图表题给的一个大学的藏书的来源，好像是四个书店，第二个图是某一 个书店卖给这个大学的书中不同种类书的数量。 需要注意的是，图中列出的并 不是所有图书的种类而是部分图书种类， 因此给出的这些书的总数小于这个书店 卖给大学的书，要用第一个表中的数据，题目中有一个好像用到了，但是即使没 注意到这个问题也不一定做错。 7. 比较 25 的九次方的倒数 与 等的 625 的 4 次方还是几次方的 最后两个结果是相

8. 有个等腰直角三角形内嵌正方形的题，开始还没想到，后来才想起来。问一 个三角形的面积占总面积的比例。 9. 还有一个是正方形绕一点旋转，对着那点绕成的圆面积 10. 一道图表分析题，提供了一个柱面图，显示了几年间某公司在欧洲分部和美 国分部的年收入情况，出了三道题， 其中有一个概念没搞懂："the constant 1980 dollars"。 11. 三角型三边长 5，6，8，问你 5，6 边夹的那个角和 90 度比较 12. 一个数列是 S(n+1)=(1/3)Sn，问你 S(11)和 S(28)/(3^17)的关系 13. 投资\$96,000，simple annual interest,第一个月拿了\$960 利息，问年利息多少 14. 一个班 75%的同学分数在 70 分以上，60%的同学分数在 85 分以下，问 70～ 85 分之间的比例 15. 有一个圆心在坐标系原点的圆，再画一条 slope 是 1/2 的直线，问第一象限 交点的坐标 数轴上有两个负数，三个正数，任取三个，问取到不同三个正数的概率 16. -1<x<y<0,然后给三个表达式,x+y,xy,x(y^2),三个排序.这题是选择题

17. 已知三个不等正整数之和为 76,问其中最大的一个数 a,它最小的可能值是多 少.这题是填空题. 三角形 10 月 1. 整体数学比我 3 年前在国内考笔考的时候难多了。第一个 Q 一上来就吓了我 一跳，一开始就是 standard deviation，然后概率、组合、解析几何都考到了， 而且不只出现一次。 2. 是一个正五边形，它的边长是另一个正五边形边长的两倍，问小的那个正五 边形是大的正五边形的几分之几。 11 月 1，有复利、等比数列，统计方面的比较多，比如 range 中位数平均数什么的。 每个 Q 平均有一个统计图的大题，要答 3 到 4 道题，难度不大，但很费时间。 还有一个算 cube 的容积什么的 2，还有那个 example 4.2.9,还有 OG 最后那个模考练习里面也有一题，具体哪题 忘掉 3，有一道，10，20,30 ，x，50,60,70，问平均数和 x 比大小。 4，还有一个 8、6、5、7 忘了是不是这些数了，说他们组成的四位数一共可以是 20 个，从小到大排列问……失忆……，好像是那个特定的数排第几个。 5，invest 多少钱,simple interest rate,求单个月的利息是多少 6，五边形，A、B、C 三个内角是 270 度，问 D、E 加起来多少度。答案 270 7，根号 x 方=9，问 2 的负 x 次方和 2 的 x 次方作比较。选 D 吧 8，特别说一下正态分布题目，没有专门考到，倒是涉及 median 的好几道 9，问了好多 rectangular, median, possible max&min, trapezoid 的，还有个直方图 我貌似看见所有人都有得做 10，有道给了一组四个数，都是 80 左右的，另外一组是这四个数都减去一个 x， 问两组的方差大小，当然是一样啦 11，我考到的数列题挺多，有道是 An=1/2A(n-1)+4,A1=0,问 A100 接近多少，答 案是 8 有道 45 度等腰直角三角形面积题和一个正八边形的外接圆的圆心到各个边的角 度问题，67.5 度答案 12，输入题一道 一个数小数点右移六位，这个数等于原数的倒数乘以九，原数 是多少 0.003 无误

13， 还有道 percentile 的题， 得分 Y 是 52 X 是 64 的 percentile， 10000 学生做 200 道题，答案记得选 A，好像是说 Y 得分比 X 少，这道有点疑惑性 14，新 G 中出现了中国学生不太熟悉的唯一知识点应该是 normal distribution， 在 OG 的 289 页，考前一定要记得看的

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