Question

已知3的2M次方=5,3的N次方=10,求9的M-N次方和9的2M-N的值

Answer 1

3^2m=5 → 9^m=5

3^n=10 →9^n=100

9^m/9^n=9^(m-n)=1/20

3^2m=5 → 9^2m=25

3^n=10 →9^n=100

9^(2m-n)= 9^2m/9^n=1/4