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

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=-1$, $b=3$, $c=3$, $a/b=-\frac{1}{3}$ e $ca/b=3\cdot \left(-\frac{1}{3}\right)a^2b$

Applicare la formula: $ab$$=ab$, dove $ab=3\cdot -1$, $a=3$ e $b=-1$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=-3$, $b=3$ e $a/b=-\frac{3}{3}$