Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=-1$, $b=2$, $c=4$, $a/b=-\frac{1}{2}$ e $ca/b=4-\frac{1}{2}a^3a$

Applicare la formula: $ab$$=ab$, dove $ab=4\cdot -1$, $a=4$ e $b=-1$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=-4$, $b=2$ e $a/b=-\frac{4}{2}$

Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=-2a^3a$, $x=a$, $x^n=a^3$ e $n=3$

Applicare la formula: $a+b$$=a+b$, dove $a=3$, $b=1$ e $a+b=3+1$