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标题: GG13-Set 7/ [打印本页]

作者: jimei12345    时间: 2008-9-18 14:43
标题: GG13-Set 7/

Q36:

If a and b are positive integers such that a-b and a/b are both even integers, which of the following must be an odd integer?

A. a/2

B.b/2

C. (a+b)/2

D. (a+2)/2

E. (b+2)/2

根据题目给的前提,可以推得a, b都是偶数。那么D和E都势必是奇数了,不知道这样的推理有没有错?答案是D,想不通为何E不对...


作者: jimei12345    时间: 2008-9-19 15:16
望大虾指教 谢谢!
作者: yoyo0327    时间: 2008-9-19 16:26
a=4, b=2
作者: jimei12345    时间: 2008-9-20 15:44

谢谢!






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