Question

3的m次方=4,3的m-4n的平方=81分之4 求1999n的平方==?

Answer 1

3^m=4

3^(m-4n)=4/81

3^m/3^4n=4/81

4/3^4n=4/81

3^4n=81

3^4n=3^4

4n=4

n=1

1999n^2

=1999*1^2

=1999*1

=1999