SAT数学练习题及详细答案解析(4)

　　下面是5道SAT数学练习题，每道题目后面都有答案和详细的解析，希望同学们在练习的时候先不看答案，看看自己的能做对几道题，然后再与答案对照，找出错题原因，针对自己的SAT数学复习进行查漏补缺。

　　1. If f(x = (x + 2 / (x-2 for all integers except x=2, which of the following has the greatest value?

　　A. f(-1

　　B. f(0

　　C. f(1

　　D. f(3

　　E. f(4

　　2. ABCD is a square of side 3, and E and F are the mid points of sides AB and BC respectively. What is the area of the quadrilateral EBFD ?

　　A. 2.25

　　B. 3

　　C. 4

　　D. 4.5

　　E. 6

　　3. If n ≠ 0, which of the following must be greater than n?

　　I 2n

　　II n²

　　III 2 - n

　　A. I only

　　B. II only

　　C. I and II only

　　D. II and III only

　　E. None

　　4. After being dropped a certain ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 125 inches. How high (in inches will it reach after its fourth bounce?

　　A. 20

　　B. 15

　　C. 8

　　D. 5

　　E. 3.2

　　5. n and p are integers greater than 1

　　5n is the square of a number

　　75np is the cube of a number.

　　The smallest value for n + p is

　　A. 14

　　B. 18

　　C. 20

　　D. 30

　　E. 50