题目信息
The operation $$\bigodot$$ is defined for all nonzero numbers a and b by $$a \bigodot b =\frac a b-\frac b a$$. If x and y are nonzero numbers, which of the following statements must be true?
I.$$x \bigodot xy = x(1 \bigodot y)$$
II.$$x \bigodot y = -(y \bigodot x)$$
III.$$\frac1 x \bigodot \frac1 y$$ =$$ y \bigodot x$$
I.$$x \bigodot xy = x(1 \bigodot y)$$
II.$$x \bigodot y = -(y \bigodot x)$$
III.$$\frac1 x \bigodot \frac1 y$$ =$$ y \bigodot x$$
A:I only
B:II only
C:III only
D:I and II
E:II and III
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正确答案:
E:II and III
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