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标题: 请教一道DS题 [打印本页]

作者: Economics 时间: 2006-9-19 06:23 标题: 请教一道DS题

Is n an integer?
(1) n^2 is an integer
(2) (sqr)n is an integer
注：(sqr)是开根号

答案是B，为什么单独条件一不充分？

作者: tangjinxiong 时间: 2006-9-19 13:12

if n is (sqr)2, n^2=2 is an interger, but n is not an interger

作者: Economics 时间: 2006-9-21 06:11

Thanks a lot.

ps: your spelling of integer is wrong

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