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SAT模拟考试题:SAT数学练习题(17)

2016-08-11 16:57:28来源:网络

  SAT模拟考试SAT数学练习题(17):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: If a · b = 18 and a / b = 2, a > 0, b > 0 then:

  (a) a = 18 and b = 1

  (b) a = 9 and b = 2

  (c) a = 18 and b = 9

  (d) a = 6 and b = 3

  (e) a = 6 and b = 6

  Answer: a / b = 2

  a = 2·b.

  a·b = (2· b)· b

  a·b = 2· b 2.

  2· b 2 = 18

  b 2 = 9,

  b = 3 because b > 0,

  a = 2· b

  a = 6.

  Question #2: The ratio of the radii of two circles is r1/r2 = 6. What is the ratio of the perimeters P1/P2 and the ratio of the areas of the two circles A1/A2?

  (a) perimeter ratio = 1/6, area ratio = 36

  (b) perimeter ratio = 36, area ratio = 6

  (c) perimeter ratio = 6, area ratio = 36

  (d) perimeter ratio = 1/8, area ratio = 8

  (e) perimeter ratio = 1/6, area ratio = 6

  Answer: r1 / r2 = 6;

  Perimeter1 / Perimeter2 = (2· ¶· r1)/(2· ¶· r2) = r1/ r2 = 6

  Area1 / Area2 = (¶· r12)/ (¶· r22) = r12 / r22 = 36

  Question #3: What value x satisfies both 1/x < 1/7 and x 2 > 16?

  (a) x = 1

  (b) x = -5

  (c) x = -1

  (d) x = 7

  (e) x = 6

  Answer: x 2> 16 means (x - 4)· (x + 4) > 0.

  x can be lower than -4 or higher than 4.

  1/x < 1/7; (7-x) / 7x < 0.

  x can be lower than 0 or higher than 7.

  In conclusion, x can be lower than -4 or higher than 7. The only correct answer is x = -5.

  Question #4: A lottery sells 1000 tickets and there is only one winning number. 200 New Jersey residents buy 2 tickets each, 300 New York

  residents buy 1 ticket each and the rest are sold in Connecticut. What is the probability that the wining ticket was bought in New Jersey?

  (a) 3/5

  (b) 1/2

  (c) 2/5

  (d) 1/5

  (e) 4/5

  Answer: There are 400 tickets sold in New Jersey out of a total of 1000, so the probability will be 400/1000 = 2/5.

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本文关键字: SAT模拟考试 SAT数学

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