Given that X and y are real numbers and X − 1 + 3 (Y-2) 2 = 0, then the value of X-Y is () A. 3B. -3C. 1D. -1

From the meaning of the question, X-1 = 0, Y-2 = 0, the solution is x = 1, y = 2, so X-Y = 1-2 = - 1

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