Applicare la formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, dove $a=\frac{3}{5}x^{-4}y^{-7}$, $b=-\frac{1}{7}xy^{-1}$ e $a+b=\frac{3}{5}x^{-4}y^{-7}-\frac{1}{7}xy^{-1}$

Applicare la formula: $x^mx^n$$=x^{\left(m+n\right)}$, dove $x=y$, $m=-7$ e $n=-1$

Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=\frac{6}{5}\cdot -\frac{1}{7}x^{-4}y^{-8}x$, $x^n=x^{-4}$ e $n=-4$

Applicare la formula: $\left(ab\right)^n$$=a^nb^n$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=6$, $b=5$, $c=-1$, $a/b=\frac{6}{5}$, $f=7$, $c/f=-\frac{1}{7}$ e $a/bc/f=\frac{6}{5}\cdot -\frac{1}{7}x^{-3}y^{-8}$