Question

已知3的m次方=10,9的n次方=5,求3的2m-6n+2次方的值.

Answer 1

3^m=10,9^n=5;

(3^m)^2=3^(2m)=10^2=100;

(3^2)^n=5,3^(6n)=((3^2)^n)^3=125;

3^(2m-6n+2)=100/125*9=7.2