4. If n
is a positive integer and n*2(n的平方)is divisible by 72, then the largest positive integer that must
divide n is
A. 6
B. 12 C. 24 D.36 E. 48
正确答案是:B
72=6×6×2,那么N里面肯定有6和2啦,所以the largest positive integer that must divide n只能是12啦!
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