作者chocaholic (whighting)
看板GRE_Verbal
标题[计量] 请教一题
时间Fri May 16 06:42:44 2008
If x is an odd integer, for which of the following equations
must y be an even integer?
(a) xy=5
(b) x+y=8
(c) x+2y=7
(d) 2(x+y)=7
(e) 2x+y=6
我用X=3代入得(c),答案是(e)
可以帮忙解答吗?
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1F：推 zitotw:(c)因为是2y所以答案和奇偶无关 140.112.5.51 05/18 11:16
2F：→ zitotw:(e)的话是 (2*奇数)偶数+y=6 y必为偶数 140.112.5.51 05/18 11:18