下面是出國留學(xué)網(wǎng)GMAT頻道整理的2015年6月GMAT數(shù)學(xué)機(jī)經(jīng)(四)，歡迎閱讀。
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16 Is |x – y| > |x – z|?
(1) |y| > |z|
(2) x < 0
17 In a set of 400 integers, is the sum of them greater than 0.1?
(1) The greatest one is less than 0.0002.
(2) The sum of greatest 50 integers is 0.01.
18 If points (a,b) and (c,d) are on line k, is the slope of line k positive?
(1) a < c, and b < d.
(2) The product of x-‐intercept and y-‐intercept is negative.
19 If 3^x – 3^(x – 3) = 26/3^9, what is the value of x
A. 6
B. -6
C. 9
D. -9
E. 13
20 If x and y are integers, what is the value of (x + y)^2?
(1) x = y – 3
(2) x and y are prime numbers.