10m/10n=4所以102m/10n=16,所以2m/n=ln16所以9m/3n=32m/3n=3的ln16次方
10^m = 2010^n = 1/510^(m - n)= (10^m)/(10^n)= 100m - n = 2(9^m)/[3^(2n)]= (9^m)/(9^n)= 9^(m - n)= 9^2= 81
提出错了吧？应该是3的2n次方
