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标题: 请教各位一道题 [打印本页]

作者: crystalbain    时间: 2010-8-10 06:46     标题: 请教各位一道题

What is the value of n?
(1)n is between 0 and 1
(2)7/16 is 3/8 more than n

(A)Statement (1) alone is sufficient,statement (2) alone is not sufficient
(B)Statement (1) alone is sufficient,statement (2) alone is not sufficient
(C)Both statements together are sufficient,but neither statement alone is sufficient
(D)Each statement alone is sufficient
(E)Statement (1) and (2) together are not sufficient.
answer(B)

the key problem is what's the meam of statement (2)?Thank you for your help.
作者: sumerlaws    时间: 2010-8-10 21:13

不管理解成7/16比n多3/8 还是7/16比n多3/8倍 n都有唯一解
作者: reddragon    时间: 2010-8-11 06:42

(1) n有很多选择 1/3 1/2 1/5等 不充分
(2)n=7/16-3/8=1/16  解唯一 充分
作者: crystalbain    时间: 2010-8-11 21:17

谢谢楼上二位,误把is当成某种运算,呵呵




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