Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=900$, $b=1$ e $a/b=\frac{900}{1}$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=9$, $b=15$ e $a/b=\frac{9}{15}$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=3$, $b=5$, $c=900$, $a/b=\frac{3}{5}$ e $ca/b=900\cdot \left(\frac{3}{5}\right)$

Applicare la formula: $ab$$=ab$, dove $ab=900\cdot 3$, $a=900$ e $b=3$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=2700$, $b=5$ e $a/b=\frac{2700}{5}$