Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=b^{-3}$, $a^m=b^2$, $a=b$, $a^m/a^n=\frac{2a^5b^2}{5a^7b^{-3}}$, $m=2$ e $n=-3$

Applicare la formula: $\frac{a^m}{a^n}$$=\frac{1}{a^{\left(n-m\right)}}$, dove $m=5$ e $n=7$

Applicare la formula: $a+b$$=a+b$, dove $a=7$, $b=-5$ e $a+b=7-5$

Applicare la formula: $a\frac{b}{c}$$=\frac{ba}{c}$, dove $a=3$, $b=2b^{5}$ e $c=5a^{2}$

Applicare la formula: $ab$$=ab$, dove $ab=2\cdot 3b^{5}$, $a=2$ e $b=3$