gmat数学题.if n is a positive integer and n^2 is divisible by 7
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gmat数学题.if n is a positive integer and n^2 is divisible by 72,then the largest positive integer that must divide n is 答案是24,
72=8*9=2*2*2*3*3
若72a=2*2*2*3*3a=n^2
所以n最小为2*2*3=12,a=2.
再问: 额题目要求largest?
再答: must divide n 什么意思呀?
再问: 应该是n能被所求数整除吧你试试?
再答: if n is a positive integer and n^2 is divisible by 72
正如上面所说,72a=2*2*2*3*3a=n^2,n至少含有因子2 2 3,
故n最小可能是12,其次是24,36,48,60……即12的倍数。
the largest positive integer that must divide n
按照你说,可以整除n的数,n=12k,k=1,2,3,4……
所以没有最大的,只有最小的。
其实不必纠结这个问题。能理解就好。。
再问: 题目说一定能被n整除的可能后面那些大的数是有可能但不是必然的?
再问: 那答案也应该是12哦
再问: 诶不对
再答: 有些小问题不必太纠结。不如看点别的题目。
再问: 恩恩你是对的,我看错答案,应该是12
若72a=2*2*2*3*3a=n^2
所以n最小为2*2*3=12,a=2.
再问: 额题目要求largest?
再答: must divide n 什么意思呀?
再问: 应该是n能被所求数整除吧你试试?
再答: if n is a positive integer and n^2 is divisible by 72
正如上面所说,72a=2*2*2*3*3a=n^2,n至少含有因子2 2 3,
故n最小可能是12,其次是24,36,48,60……即12的倍数。
the largest positive integer that must divide n
按照你说,可以整除n的数,n=12k,k=1,2,3,4……
所以没有最大的,只有最小的。
其实不必纠结这个问题。能理解就好。。
再问: 题目说一定能被n整除的可能后面那些大的数是有可能但不是必然的?
再问: 那答案也应该是12哦
再问: 诶不对
再答: 有些小问题不必太纠结。不如看点别的题目。
再问: 恩恩你是对的,我看错答案,应该是12
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