SAT數(shù)學(xué)練習(xí)題 含詳細(xì)答案解析(2).

　　下面是5道SAT數(shù)學(xué)練習(xí)題，每道題目后面都有答案和詳細(xì)的解析，希望同學(xué)們?cè)诰毩?xí)的時(shí)候先不看答案，看看自己的能做對(duì)幾道題，然后再與答案對(duì)照，找出錯(cuò)題原因，針對(duì)自己的SAT數(shù)學(xué)復(fù)習(xí)進(jìn)行查漏補(bǔ)缺。

　　1. The distance from town A to town B is five miles. C is six miles from B. Which of the following could be the distance from A to C?

　　I 11

　　II 1

　　III 7

　　A. I only

　　B. II only

　　C. I and II only

　　D. II and III only

　　E. I, II, or III.

　　Correct Answer: E

　　解析:

　　Do not assume that AB and C are on a straight line. Make a diagram with A and B marked 5 miles apart. Draw a circle centered on B, with radius 6. C could be anywhere on this circle. The minimum distance will be 1, and maximum 11, but anywhere in between is possible.

　　2. √5 percent of 5√5 =

　　A. 0.05

　　B. 0.25

　　C. 0.5

　　D. 2.5

　　E. 25

　　Correct Answer: B

　　解析:

　　We can write the statement mathematically, using x to mean ‘of’ and /100 for ‘per cent’. So ( √5/100) x 5√5 = 5 x 5 /100 = 0.25

　　3. If pqr = 1 , rst = 0 , and spr = 0, which of the following must be zero?

　　A. P

　　B. Q

　　C. R

　　D. S

　　E. T

　　Correct Answer: D

　　解析:

　　If pqr = 1, none of these variable can be zero. Since spr = 0 , and since p and r are not zero, s must be zero. (Note that although rst = 0, and so either s or t must be zero, this is not sufficient to state which must be zero)

　　4.