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SAT官方试题分享:2014年1月9日(数学)

2014-01-09

栏目:考培资讯

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下面就是我们为大家整理了SAT官方试题分享,供考生们参考,以下是详细内容。

SAT SAT考试 SAT经验 SAT技巧 SAT数学 SAT培训

  Read the following SAT test question and then click on a button to select your answer.

  Add8 times xto2 times xand then subtract5from the sum. Ifxis a positive integer, the result must be an integer multiple of

  (A)2

  (B)5

  (C)8

  (D)10

  (E)15

  答案:B

  解析:

  The mathematical expression given in the question is(8 times x) + (2 times x) minus 5, which is equivalent to(10 times x) minus 5. The expression(10 times x) minus 5can be factored as5 times ((2 times x) minus 1). For every positive integerx,5 times ((2 times x) minus 1)must be a multiple of5. Ifx = 1, then5 times ((2 times x) minus 1) = 5, which is not an integer multiple of2,8,10, or15. Therefore, the correct answer is5.

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