3^m=4,3^m-3n=4/81求2008^n的值
问题描述:
3^m=4,3^m-3n=4/81求2008^n的值
答
应该是:3^m-4n=4/81?
3^m=4,3^(m-4n)=4/81
3^m/3^(m-4n)=3^4n=4/(4/81)=81 =3^4
4n=4
n=1
2008^1=2008