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)(七)，歡迎閱讀。
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31 If all three sides of a right triangle are, respectively, radii of three semicircles, is it possible to calculate the sum of area of three semicircles?
(1) a^2 + b^2 + c^2 = 50
(2) c^2 = 25
32 Jade save cash into 5 different bank accounts. What is the probability that Jade save most into account a and save least into account B?
A. 1/10
B. 1/20
C. 1/40
D. 1/60
E. 1/80
33 If the radius of small circle is 3, and the angle is 60, what is the radius of the big circle?
A. 3
B. 6
C. 9
D. 12
E. 15
34 The sum of the first k positive integers is equal to k(k +1)/2 . What is the sum of the integers from n to m, inclusive, where 0 < n < m ?
A.m(m+1)/2–(n +1)(n + 2)/2
B.m(m+1)/2–n(n +1)/2
C.m(m+1)/2–(n−1)n/2
D.(m−1)m/2–(n+1)(n+2)/2
E.(m−1)m/2–n(n+1)/2
35 Is h^2 = h ?
(1) h + h = h
(2) h –h = h
36 If k is a two-‐digit positive integer with tens digit x and units digit y, then k^2 =
A. 10x^2 + y^2
B. 100x^2 + y^2
C. 100x^2 + 10xy + y^2
D. 100x^2 + 20xy + y^2
E. 100y^2 + 20xy + x^2
37 If x and y are positive integers and r is the remainder when 3^(4x + 2) + y is divided by 10, what is the value of r?
(1) x = 25
(2) y = 1