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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

  Question #8: Out of 25 mining companies, 14 extract copper, 16 extract silver and 1 extracts neither copper nor silver. How many companies extract both silver and copper?

  (a) 1

  (b) 6

  (c) 2

  (d) 15

  (e) 3

  Answer: If x is the number of companies that extract both metals,

  1. the number of companies that extract copper only is 14 - x;

  2. the number of companies that extract silver only is 16 - x;

  There are 4 types of companies:

  -that extract copper only,

  -silver only,

  -both copper and silver

  -neither copper nor silver.

  Their total should be 25:

  25= 14 - x + 16 - x + x + 1

  x = 31 - 25 = 6

  Question #9: The isosceles triangle ABC from the figure below has the BAC angle = 400. What is the angle ADE if DE is half of BC?

  (a) 70o

  (b) 35o

  (c) 40o

  (d) It cannot be determined from the information given

  (e) 75o

  Answer: There is an infinite number of segments DE that will have half the length of BC. Fig.1 and Fig.2 show 2 possibilities. The correct answer is (d).

SAT模拟考试题:SAT数学练习题

  Question #10: For any a≠1, (a4 - 1) / (a - 1) =

  (a) a3 + a2 + a

  (b) a3 + a2 + a + 1

  (c) a2 + a + 1

  (d) 1

  (e) a + 1

  Answer: A first inspection of the choices eliminates the c, d and e answers since the answer should be a polynomial with a degree of 4 - 1 = 3.

  The correct answer is b.

  更多SAT模拟考试题及备考资料敬请查看SAT真题栏目。


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本文关键字: SAT模拟考试 SAT数学

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