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标题: 哪位有更好的办法呀！！GWD-4-35 [打印本页]

作者: XIAOXIANGXI 时间: 2006-7-23 08:09 标题: 哪位有更好的办法呀！！GWD-4-35

3-35. if n is a positive integer, which of the following is a possible value of |56-5n|?

- I just simply put every answer to the equation for testing, which i think is quite awkward.....so anybody has a better idea?

作者: smalllittle 时间: 2006-7-24 13:13

就5个选项，都试一下很快的。如果一定要研究的话,可以用n=12做分界，去掉绝对值，

得出该绝对值的两个等式：

n<12 时，值为 5P+1 10=>p>=0

n>=12时值为 5k+4 k>=1

不过，我觉得还不一定有代进去快

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