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720共有几个因数?与5互质的有哪些?
人气:339 ℃ 时间:2020-04-10 14:51:51
解答
因数有:1,2,3,4,5,6,8,9,10,12,15,16,18,20,24,30,36,40,45,48,60,72,80,90,120,144,180,240,360,720.
与5互质的有:
2,3,4,6,8,9,12,16,18,24,36,48,72,144,.
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