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标题: [求助]读题不懂 请教 [打印本页]

作者: katherine8110    时间: 2007-4-28 07:20     标题: [求助]读题不懂 请教

if n is a positive integer and n2 is divisible by 72, then the largest positive integer that must divide n is?

A 6, B 12, C 24, D 36, E 48

读的死去活来,很容易得到N最小为12,实在不理解then the largest positive integer that must divide n is是什么意思

答案为C


作者: 憨憨    时间: 2007-4-28 13:16

我觉得是不是答案错啊? the largest positive integer that must divide n is就是能整除n的最大正整数啊,那就应该找n2最小值,最小值是当n=12时,n2=144,所以这个最大正整数为12,怎么得出24呢???


作者: katherine8110    时间: 2007-4-28 21:04

谢谢! 我也觉的答案错了.




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