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新SAT数学练习题附答案解析(8)

2018-05-21 19:57:16来源:新东方在线论坛

  新SAT数学练习题解析

  5.Correct Answer: D

  Explanation:

  If two sets of four consecutive integers have one integer in common, the total in the combined set is 7., and we can write the sets as

  n + (n + 1) + (n + 2) + (n + 3 ) and

  (n + 3) + (n + 4) + (n + 5) + (n + 6)

  Note that each term in the second set is 3 more than the equivalent term in the first set. Since there are four terms the total of the differences will be 4 x 3 = 12

  6.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.

  

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