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SAT模拟考试题:SAT数学练习题(16)

2016-08-11 16:56:26来源:网络

  SAT模拟考试SAT数学练习题(16):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。

  Question #1: f(x) = 1/(x + 1) and g(x) = x + 1. What are the values of x for which f(x) = g(x)?

  (a) x1 = 0 and x2 = 2

  (b) x1 = 0 and x2 = 1

  (c) x1 = 2 and x2 = -2

  (d) x1 = 0 and x2 = -2

  (e) x1 = 1 and x2 = -2

  Answer: f(x) = g(x) means x + 1 = 1/(x + 1);

  (x + 1) · (x + 1) = 1;

  x2 + 2 · x = 0

  x · (x + 2) = 0 so x1 = 0 and x2 = -2.

  (d) is the correct answer.

  Question #2: A website had 2,000 unique visitors in 5 days. At the same rate, how many days are needed to achieve 12,000 unique visitors?

  (a) 15 days

  (b) 30 days

  (c) 40 days

  (d) 120 days

  (e) 20 days

  Answer: 2000 visitors in 5 days means that the website has 2000/5 = 400 visitors/day.

  12,000 visitors / (400visitors / day) = 30 days.

  Question #3: If a is an integer chosen randomly from the set {3, 4, 5, 9} and b is an integer chosen randomly from the set {3, 8, 12, 15}, what is the probability that a/b is an integer?

  (a) .25

  (b) .2

  (c) .125

  (d) .375

  (e) .4

  Answer: We have 4 possible integers for a and 4 for b, so the number of possible combinations for (a / b) is 16

  a/b is an integer only for 2 combinations:

  1. a = 3 and b = 3

  2. a = 9 and b = 3

  The probability that a/b is an integer is 2/16 = 1/8 = .125 and (c) is the correct answer.

  Question #4: Two of the sides of a triangle are 7 and 6. What of the following could be the perimeter of the triangle?

  (a) 14

  (b) 26

  (c) 18

  (d) 9

  (e) 12

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本文关键字: SAT模拟考试 SAT数学

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