20100912-GMAT陈婧-逻辑数学课教材---答案.doc

练习1. 将以下信息表达为数学式子1-1. Y= X+501-2. A = 2/3 B1-3. X = 2B.1-4. Jack is now 14 years older than Bill. If in 10 years Jack will be twice as old as Bill, how old will Jack be in 5 years?A. 9B. 19C. 21D. 23E. 331-5.D2. C. 20%3. B4. 18 5.一样大6.C7.D.8. C 9.A. 10.B11.一群鹅，用来做移民（Immigration）试验，30%是公的，在移民的鹅中20%是公的，问：公鹅的迁徙率比母鹅的迁徙率是多少？12.50%13.8个14.B 15.1X5-21216-1. 19 16-2. 33 16-3. 14 17.A 18.B19. E20.B21.Note: The figure is not drawn to scale.A rectangular picture is surrounded by a boarder, as shown in the figure above. Without the boarder the length of the picture is twice its width. If the area of the boarder is 196 square inches, what is the length, in inches, of the picture, excluding the boarder?A. 10 B. 15 C. 30 D. 40 E. 60 22. D 23. B24.C5,3 * P3,3？25.3*3*3*326.正向解题：C4,3 + C4,2*C5,1+C4,1*C5,2逆向思维：C9,3 C5,3 27.C5,2*C10,228D29.3/830.P4,4 31.1.一个人扔飞镖，击中靶心的概率是0.7， 这个人连续扔了4次飞镖，其中有2次扔中靶心的概率是多少？ 32.A33.3/834.A；35. B. 0.1236.E. 9%37.Cars X and Y were traveling together on a straight road at a constant speed of 55 miles per hour when car X stopped for 5 minutes. If car Y continued to travel at 55 miles per hour, how many minutes from the time that car X resumed traveling did it take car X traveling at 60 miles per hour to catch up with car Y ? (Assume that the time for car X to slow down and speed up was negligible.A. 5B. 30C. 45D. 55E. 6038.If Art and Rita can do a job in 4 hours when working together at their respective constant rates and Art can do the job alone in 6 hours, in how many hours can Rita do the job alone?39.If A can do a job in 20 days and B can do the job in 30 days, they work together to do this job and in this period, A stop work for 2.5 days and B stop work for x days, and the job be finished for 14 days, what is x?40. If x(2x+1)=0 and (x+)(2x-3)=0, then x= A. -3B. -C. 0D. E. 附录一GMAT数学词汇表5integer整数factor因子divisor因子,除数multiple倍数，成倍，乘divisible可被整除的reminder余数quotient商odd integers奇数even integers偶数prime number质数composite number合数perfect square number完全平方数perfect cube number完全立方数the greatest common divisor最大公约数the least common multiple最小公倍数the nth power of x：Xnthe nth root of X: nXsquare root平方根cube root立方根fraction分数，numerator 分子denominator 分母mixed number繁分数improper fraction假分数proper fraction 真分数thousands千位hundreds百位tens十位units = ones个位decimal point = point = period 小数点tenths十分位hundredths百分位thousandths千分位to the nearest 四舍五入 decimal notation 十进制计数scientific notation 科学计数法terminating decimal有限小数mean 算术平均数median 中数mode 众数range值域standard deviation 标准差element 元素subset 子集union并集disjoint or mutually exclusive没有交集intersection 交集 coefficient 系数 constant term 常数项 polynomial 多项式 quadratic = second degree 二次的 solution = root 方程的解 exponents 幂，指数sequence = progressiongeometric sequence 等比数列arithmetic sequence 等差数列function 函数 coordinate system = x y-planequadrant 象限 x coordinate x轴坐标horizontal line = x axis x轴 y coordinate y 轴坐标perpendicular line = y axis y轴 slope 斜率intercept 截距：x intercept；y interceptintersect 相交 vertical 对顶角 straight angel 平角 acute angel 锐角 obtuse angel 钝角 right angel 直角 parallel lines 平行线side边 vertices顶点 triangle三角形 quadrilateral四边形 pentagon五边形 hexagon六边形 regular polygon正多边形 hypotenuse斜边area of a triangle三角形的面积 leg直角边 altitude高 base底 equilateral triangle 等边三角形 isosceles triangle等腰三角形diagonal对角线 rectangle长方形 square正方形 trapezoid梯形 rhombus菱形 parallelogram平行四边形chord弦 diameter直径 circumference周长 radius半径 arc弧 point of tangency切点 inscribed内接的 circumscribed外切的 rectangular solid长方体 cube立方体 face = surface面 edge边 vertex