Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=m^{-7}$, $a^m=m^{-5}$, $a=m$, $a^m/a^n=\frac{25m^{-5}}{5m^{-7}}$, $m=-5$ e $n=-7$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=25m^{2}$, $a=25$, $b=m^{2}$, $c=5$ e $ab/c=\frac{25m^{2}}{5}$