Applicare la formula: $x^mx^n$$=x^{\left(m+n\right)}$, dove $x=a$, $m=-4$ e $n=3$

Applicare la formula: $x^mx^n$$=x^{\left(m+n\right)}$, dove $x=b$, $m=-3$ e $n=-4$

Applicare la formula: $x^a$$=\frac{1}{x^{\left|a\right|}}$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=1$, $b=a$, $c=1$, $a/b=\frac{1}{a}$, $f=b^{7}$, $c/f=\frac{1}{b^{7}}$ e $a/bc/f=\frac{1}{a}\frac{1}{b^{7}}$