5^8-1 能被20-30之间的哪2个数整除
问题描述：
5^8-1 能被20-30之间的哪2个数整除
答
5^8-1
=(5^4+1)(5^4-1)
=(5^4+1)(5^2+1)(5^2-1)
=(5^4+1)×26×24
所以能被26和24整除