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# GRE数学

GRE 数学

The number of distinct positive factors of n 例 2:252 因子的个数是多少?

1.

, 组合计算公式:

.

2. 概率 例 9:假如世界杯比赛共有 32 支球队,分成 8 个组,每组 4 个队,每组前两名出线,然后成对进行淘汰赛,直至 决赛决出冠军,并且淘汰队不参加比赛,从中间任选出一场比赛观看是半决赛的机会有多大?

1

2 2

2

(A) -1

(B) -1/2

(C) 0

(D) 1/2

(E) 1

2

GRE 难题解析 例 1:On a certain number line, if -7 is a distance of 4 from n and 7 is a distance of 18 from n ,then n=? (A) 25 (B) 11 (C)- 3 (D) 11 (E)-11

to make

4-n 4-n

6 5

both of the statements true for all integers n such that -2< n≤3? (A) ≤ (B) < (C) = (D) > (E) ≥

(A) 144

(B) 140

(C) 134

(D) 125

(E) 106

3

In 1984 median income for a person in the 55~64 age category was in which of the following intervals? (A) less than \$10,000 \$25,000~\$34,999 (B) \$10,000~\$19,999 (E) \$35,000~\$49,999 (C) \$20,000~\$24,999 (D)

what was the median number of errors in the sample? (A) 3 (B) 3.5 (C) 4 (D) 4.5 (E) It cannot be determined from the information given. 例 9:d=7.56872 and D is the decimal expression for d rounded to the nearest thousandth. The number of decimal place where d and D differ 4

8inches
4

squares of this design, how many L-shaped tiles will be needed? (A) 810 (B) 405 (C) 270 (D) 135 (E) 45

5

300

400

500

pk 0.10 0.25 0.20 0.25 0.20 例 22 : If in an experiment the probabilities of obtaining the values a1,a2,a3,a4,a5 are p1,p2,p3,p4,p5 , respectively, then the expected value is defined as a1 p1 + a2 p2 +a3 p3 + a4 p4 + a5p5. For the values and their corresponding probabilities in the table above, what is the expected value? (A)350 (B)320 (C)300 (D)270 (E)250

The standard deviation of the sample measurements 1, 3, 5, 7, and 9

60 percent

(E)120 and 178

6

GRE 数学常用符号及术语 一.数学中常用符号 +: plus X: multiply -: subtract ÷: divide V~: square root |...|: absolute value =: is equal to =/=: is not equal to >: is greater than <: is less than //: is parallel to _|_: is perpendicular to >=: is greater than or equal to (或 no less than) <=: is less than or equal to (或 no more than) 二.表达相应数目的前缀 1:uni-,mono2:bi-,du-,di3:tri-,ter-, 4:tetra-,quad-, 5:penta-,quint, 6:hex-,sex-, 7:sept-,hapta-, 8:oct, 9:enn-, 10:dec-,deka-, 三.数学中常用单词术语

abscissa absolute value acute angle adjacent angle addition algebra altitude angle bisector arc area arithmetic mean

arithmetic progression arm at average base

7

be contained in bisect center chord circle circumference circumscribe clockwise closest approximation combination common divisor common factor complementary angles Composite number

concentric circle

cone congruent consecutive integer coordinate cost counterclockwise cube

cylinder decagon decimal decimal point decreased decrease to decrease by degree define denominator denote depreciation distance distinct dividend divided evenly divisible division divisor down payment equation equilateral triangle even number expression exterior angle face factor fraction geometric mean

geometric progression have left height

8

hexagon hypotenuse improper fraction increase increase by increase to inscribe intercept integer interest rate in terms of... interior angle intersect irrational isosceles triangle least common multiple least possible value leg length list price margin mark up mark down maximum median, medium

median of a triangle mid point minimum minus multiplication multiple multiply natural number negative number nonzero number lines numerator obtuse angle

octagon odd number ordinate overlap parallel lines parallelogram pentagon per capita perimeter permutation perpendicular lines pyramid plane plus polygon positive number power prime factor prime number product profit proper fraction proportion purchasing price quadrant quadrihedrogon quadrilateral quotient ratio rational radius radian real number reciprocal rectangle rectangular prism reduced regular polygon remainder retail value rhombus right angle right triangle round

sale price segment set sequence scalene triangle side simple interest slope solution speed sphere

square square root straight angle subtract subtraction sum surface area supplementary tangent tenths' digit tenth tie times total

angles

to the nearest trapezoid triangle two digits units' digit veiocity vertex angle vertical angle volume whole number width 3-digit number

9

10

1. a only if b 表示 a==>b 2. a if only b 表示 b==>a 3. 2/3 as many A as B 是: A 为 B 的 2/3 4. twice as many A as B 是: A 为 B 的 2 倍

11

GRE数学四个大陷阱解析

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