10^m=510^n=410^(2m-3n+1)=10^(2m)/10^(3n) × 10^1=(10^m)^2/(10^n) ^3 × 10=5^2/4 ^3 × 10=125/32
10^(2m-3n+1)=(10^m)^2*(10^n)^(-3)*10=5^2*(1/64)*10=125/32
