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标题: 再请教思路 [打印本页]

作者: assurance    时间: 2006-3-30 07:28     标题: 再请教思路

If C and D are integers, is C even?

(1)c(d+1)even

(2)(c+2)(d+4)even

answer: C


作者: poorleafs    时间: 2006-4-1 13:49

(1)c(d+1)even,说明c even 或者d+1 even 或者 both even

(2))(c+2)(d+4)even说明c+2 even或者d +4even或者 both even

综合,因为d+1和d+4不可能同时 even,因此只有c even.


作者: assurance    时间: 2006-4-2 07:58

I got it,thanks !!!




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