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2018年12月2日GRE数学机经预测

2018-11-28 14:48 小马过河 admin

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摘要:How many integers from 1 to 900 inclusive have exactly 3 positive divisors? A. 10 B. 14 C. 15 D. 29 E. 30

题目1

How many integers from 1 to 900 inclusive have exactly 3 positive divisors? A. 10 B. 14 C. 15 D. 29 E. 30

答案:A
题目2

Let S be the set of all positive integers n such that n2 is a multiple of both 24 and 108. Which of the following integers are divisors of every integer n in S? Indicate all such integers. A. 12 B. 24 C. 36 D.72

答案AC
题目3

What is the sum of all possible solutions to the equation:  = + 1 A. -2 B. 2 C. 3 D. 5 E. 6

答案D
题目4

If x is 4 more than half of y and if y is 10 more than half of x, what is the value of x?
答案:12

题目5

In the rectangular coordinate system, the point (3,1) is on the circle with center (0, -3)。 What is the area of the circle? A. 5π B. 7π C. 10π D. 25π E. π√7
答案:D

题目6

Which of the following statements about triangle PQR shown in the xy-plane are true? Indicate all such statements. A. PQR is a right triangle. B. The area of PQR is 15/2. C. PQR is an isosceles triangle
答案:C

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