Question 101874
{{{9r^5u/m^6}}}divided by{{{(3r^3m^2)}}}
Multiplying the same base, you add exponents.
Dividing the same base, you subtract exponents. 
{{{9r^5u/m^6/(3r^3m^2)=3r^(5-3)u/m^(6+2)=3r^2u/m^8}}}