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For all numbers a and b, the operation is defined by a ⊕ b = $$a^2 - ab$$. If xy ≠ 0, then which of the following can be equal to zero?
I. x ⊕ y
II. xy ⊕ y
III. x ⊕ (x + y)
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A.II only
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B.I and II only
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C.I and III only
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D.II and III only
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E.All of the above
B显示答案
