Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=x^2$, $a^m=x^4$, $a=x$, $a^m/a^n=\frac{20x^4y^3z}{-5x^2y^2}$, $m=4$ e $n=2$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=y^2$, $a^m=y^3$, $a=y$, $a^m/a^n=\frac{20x^{2}y^3z}{-5y^2}$, $m=3$ e $n=2$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=20x^{2}yz$, $a=20$, $b=x^{2}yz$, $c=-5$ e $ab/c=\frac{20x^{2}yz}{-5}$