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备料SAT:SAT数学真题解析四则

503人浏览 2018-11-28 分享到|

  现在有很多的小伙伴都在备考SAT考试,这因为SAT考试成绩,在申请美国大部分大学时都是必须提供的,所以SAT考试现在很受留学生们的关注,大家都知道SAT数学对于同学们来说是比较容易拿分的一项,但想拿高分,平时还是要多加练习,那么今天小编就给大家带来SAT数学真题解析四则,希望大家在平时备考的时候就要多加练习,让自己熟能生巧,考试不慌。

  一、真题四则:

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

  I 2n

  II n*n

  III 2 - n

  A. I only

  B. II only

  C. I and II only

  D. II and III only

  E. None


备料SAT:SAT数学真题解析四则


  3. 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

  4. 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

  二、答案解析:

  1.Correct Answer: D

  Explanation:

  You can solve this by back solving – substitute the answer choices in the expression and see which gives the greatest value.sat

  A (-1 + 2) / (-1-2) = -2 / 2 = -1;

  B (0 + 2) / (0-2) = 2/ -2 = -1;

  C (1 + 2) / (1-2) = 3/-1 = -3;

  D (3 + 2) / (3-2) = 5/1 = 5;

  E (4+ 2) / (4-2) = 6/2 = 3

  If you had just chosen the largest value for x you would have been wrong. So although it looks a long method, it is actually quick and accurate since the numbers are really simple and you can do the math in your head.

  2.Correct Answer: E

  Explanation:

  Remember that n could be positive negative or a fraction. Try out a few cases: In case I, if n is -1, then 2n is less than n. In case II, if n is a fraction such as ? then n2 will be less than n. In case III, if n is 2, then 2-n = 0, which is less than n. Therefore, none of the choices must be greater than n

  3.Correct Answer: C

  Explanation:

  If after each bounce it reaches 2/5 of the previous height, then after the second bounce it will reach 2/5 x 125. After the third it will reach 2/5 x 2/5 x 125. After the fourth it will reach 2/5 x 2/5 x 2/5 x 125. This cancels down to 2 x 2 x 2 = 8

  4.Correct Answer: A

  Explanation:

  The smallest value for n such that 5n is a square is 5. 75np can now be written as 75 x 5 x p. This gives prime factors.... 3 x 5 x 5 x 5 x p To make the expression a perfect cube, p will have to have factors 3 x 3 , and hence p =9 n + p = 5 + 9 = 14.

  以上就是针对SAT数学题的相关知识,希望大家平时多加练习,如果想了解更多关于SAT真题数学解析的内容,请多多关注本网站,也可以添加微信号kewo11。


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备料SAT:SAT数学真题解析四则

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