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SAT數學真題練習,用一道真題來告訴你破解SAT數學考試技巧

2019-06-05 11:30:50瀏覽量:321

SAT數學備考必不可少練習真題,啟德考培小編找到了一道典型的SAT數學題型,來幫助大家找到備考sat數學方法。

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  SAT數學備考練習的時候,大部分的同學都會選擇先做一些真題,這樣能夠幫助我們更好地了解真正的SAT數學考試的類型以及難易程度等,所以啟德考培小編找來了一道典型的SAT數學題型,來幫助大家找到備考sat數學方法。

  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)

  解析:

  Correct Answer: D

  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

  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

  解析:

  Correct Answer: D

  Explanation:

  (Total area of square - sum of the areas of triangles ADE and DCF) will give the area of the quadrilateral 9 - (2 x ? x 3 x 1.5) = 4.5

  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

  解析:

  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

  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

  解析:

  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

  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

  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.

  解析:

  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

  以上就是關于“SAT數學真題練習內容”的內容,希望通過上述內容的學習,大家能夠更好地備考SAT數學考試,預祝同學們考試成功。

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