SAT数学解题方法:逻辑推理

2022-05-18 13:46:28

  

  SAT数学解题方法中关于逻辑推理的部分是SAT数学考试中独有的,在国内的考试中不常见。这类题目和数学运运算毫无关联,题目较少,但十分新颖。乍一看让人有些迷惑不解,其实只要掌握了恰当的方法,解题十分容易。

  例题:

  Family

  Numbers of Consecutive

  Nights

  Jackson

  10

  Callan

  5

  Epstein

  8

  Liu

  6

  Benton

  8

  The table above shows the number of consecutive nights that each of five families stayed at a certain hotel during a 14-night period. If the Liu family’s stay did not overlap with the Benton family’s stay, which of the 14 nights could be a night on which only one of the five families stayed at the hotel?

  A. The 3rd B. The 5th C. The 6th D. The 8th E. The 10th

  解答:此题只要借助线段,便一目了然了。既然原文说“the Liu family’s stay did not overlap with the Benton family’s stay”,而且两家刚好加在一起正好是14晚,那么不妨将这14晚设为一段长14cm的线段,从6cm处分割:

  Liu Benton family family︳______ ____︳_________________︳

  0 6cm 14cm

  ︳________10cm__________︳

  ︳________10cm__________︳

  上题的解答过程就是利用逻辑推理的过程,由于Jackson family是剩余家庭里呆得时间最长的,所以只要从他家看起即可。该题可以简单转化为一段长10cm的线段在14cm范围内左右移动,要么露出最左面的 0~4cm空间(不包括4),要么留出最右面的10~14cm(不包括10)。所以没有被 Jackson family所覆盖的只有这两个区间,也就是说只有一家居住的只能是前三天或后三天,答案为A。

  SAT数学解题方法的掌握可以让大家更加有效率的解答SAT数学题目,尤其是当大家能熟练掌握SAT数学方面的词汇并且对这些SAT数学解题方法有所了解的时候,通过真题不断进行练习,那么最后考出理想的数学成绩甚至800分满分对聪明的中 国考生而言绝非难事。

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