GMAT 考满分题库

Magoosh - 数学PS - 285
For all numbers a and b, the operation is defined by$$a\oplus b = a^{2} - ab. If xy \neq 0$$, then which of the following can be equal to zero?

I. $$x\oplus y$$

II. $$xy\oplus y$$

III. $$x\oplus (x + y)$$
  • AII only
  • BI and II only
  • CI and III only
  • DII and III only
  • EAll of the above
显示答案
正确答案: B

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