25^7-5^12
=(5²）^7-5^12
=5^14-5^12=2^(12+2)-5^12=2^12×5^2-5^12
=5^12(5^2-1)
=5^12(25-1)
=5^12×24
=……
帮忙!利用因式分解说明25^7-5^12能被30整除
25^7-5^12
=(5²）^7-5^12
=5^14-5^12=2^(12+2)-5^12=2^12×5^2-5^12
=5^12(5^2-1)
=5^12(25-1)
=5^12×24
=……