GMAT
题目
If x and y are negative integers, and if x - y = 1, what is the least possible value of xy?
解析
正确选项：C
满足条件的最小值出现在\(x = -1\)、\(y = -2\)时，此时\(x - y = 1\)。
\(xy = (-1)×(-2) = 2\)
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