og11 Problem Solving 169题

viridian · 发表于 2011-5-30 21:52:10

If n is a positive integer and n^2 is divisible by 72, then the largest positive integer that must divide n is ?

A)6

B)12

C)24

D)36

E)48

这道题的题目怎么看不懂...根据答案来说应该是能够整除N 的最小正整数才对啊....求指点...

sdcar2010 · 发表于 2011-5-30 22:16:15

This is a tricky question which tests your reading comprehension.

If a and b are integers (with a not zero), we say a divides b if there is an integer c such that b = ac.

From the stimulus, we know that n MUST have a factor of 12. So 12 is the largest positive integer that MUST divide n. This means that for all possible values of n, 12 is the largest positive factor that each value of n MUST have.

jsmart · 发表于 2011-5-30 22:20:55

B？n是正整数，n方是72的倍数，问n是最大是几的整数的倍数。

viridian · 发表于 2011-5-31 14:04:50

谢谢楼上两位的解释..明白啦原来是没有理解 A divides B 的意思~~~

og11 Problem Solving 169题

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