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GRE数学真题
For all numbers a and b, the operation is defined by a ⊕ b = fff\(a^2 - ab\)/ff...
Question 11
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For all numbers a and b, the operation is defined by a ⊕ b =
fff\(a^2 - ab\)/fff
. If xy ≠ 0, then which of the following can be equal to zero?
I. x ⊕ y
II. xy ⊕ y
III. x ⊕ (x + y)
A.II only
B.I and II only
C.I and III only
D.II and III only
E.All of the above
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