Applicare la formula: $x,\:a,\:b$$=eval\left(x,a,b\right)$, dove $a=x=3$, $b=y=\frac{1}{3}$, $x=3xy$ e $x;a=3xy,\:x=3,\:y=\frac{1}{3}$

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

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=3$, $c=9$, $a/b=\frac{1}{3}$ e $ca/b=9\cdot \left(\frac{1}{3}\right)$

Applicare la formula: $ab$$=ab$, dove $ab=9\cdot 1$, $a=9$ e $b=1$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=9$, $b=3$ e $a/b=\frac{9}{3}$