When x is a multiple of y, x = k * y, k is an integer bigger than 1.作者: winny0821 时间: 2011-3-4 06:46
multiple 倍数
C 1)的证明是米有神马问题的
2):X^2-X is a multiple of y. so assume (X^2-X)/y=K (K is an integer). >>>>(x-1)*x/y = k>>>>>>x/y = k/x-1
and k/x-1 is not necessarily an integer. so NOT Sufficient
so the answer is A
note that multiple 的意思是“倍数”作者: wenbowei911 时间: 2011-3-4 21:33
谢谢大家~
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