Applicare la formula: $\frac{a}{a}$$=1$, dove $a=y^3$ e $a/a=\frac{12x^4y^3z^2}{-4x^3y^3z}$

Applicare la formula: $\frac{a^n}{a}$$=a^{\left(n-1\right)}$, dove $a^n/a=\frac{12x^4z^2}{-4x^3z}$, $a^n=z^2$, $a=z$ e $n=2$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=x^3$, $a^m=x^4$, $a=x$, $a^m/a^n=\frac{12x^4z}{-4x^3}$, $m=4$ e $n=3$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=12xz$, $a=12$, $b=xz$, $c=-4$ e $ab/c=\frac{12xz}{-4}$