题目信息
The harmonic mean of two numbers x and y, symbolized as h(x, y), is defined as 2 divided by the sum of the reciprocals of x and y, whereas the geometric mean g(x, y) is defined as the square root of the product of x and y (when this square root exists), and the arithmetic mean m(x, y) is defined as$${x+y}\over{2}$$ For which of the following pairs of values for x and y is g(x, y) equal to the arithmetic mean of h(x,y)and m(x, y)?
A:x =-2, y = -1
B:x = -1,y = 2
C:x = 2,y=8
D:x = 8, y=8
E:x = 8, y = 64
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正确答案：
D:x = 8, y=8
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