Applicare la formula: $\frac{a}{b}+c$$=\frac{a+cb}{b}$, dove $a/b+c=\frac{3}{8}-0.2$, $a=3$, $b=8$, $c=-\frac{1}{5}$ e $a/b=\frac{3}{8}$

Applicare la formula: $ab$$=ab$, dove $ab=-0.2\cdot 8$, $a=-\frac{1}{5}$ e $b=8$

Applicare la formula: $a+b$$=a+b$, dove $a=3$, $b=-\frac{8}{5}$ e $a+b=3-1.6$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=\frac{7}{5}$, $b=8$ e $a/b=\frac{1.4}{8}$