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SAT模拟考试题:SAT数学练习题(26)

2016-08-11 17:10:12来源:网络

  SAT模拟考试SAT数学练习题(26):本文是sat数学模拟题。新东方在线SAT频道为大家整理了SAT模拟考试题,供考生们参考,以下是详细内容。

  1. If f(x) = x² – 3, where x is an integer, which of the following could be a value of f(x)?

  I 6

  II 0

  III -6

  A. I only

  B. I and II only

  C. II and III only

  D. I and III only

  E. I, II and III

  Correct Answer: A

  解析:

  Choice I is correct because f(x) = 6 when x=3. Choice II is incorrect because to make f(x) = 0, x² would have to be 3. But 3 is not the square of an integer. Choice III is incorrect because to make f(x) = 0, x² would have to be –3 but squares cannot be negative. (The minimum value for x2 is zero; hence, the minimum value for f(x) = -3)

  2. For how many integer values of n will the value of the expression 4n + 7 be an integer greater than 1 and less than 200?

  A. 48

  B. 49

  C. 50

  D. 51

  E. 52

  Correct Answer: C

  解析:

  1 < 4n + 7 < 200. n can be 0, or -1. n cannot be -2 or any other negative integer or the expression 4n + 7 will be less than1. The largest value for n will be an integer < (200 - 7) /4. 193/4 = 48.25, hence 48. The number of integers between -1 and 48 inclusive is 50

SAT模拟考试题:SAT数学练习题

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