Applicare la formula: $a+b$$=a+b$, dove $a=-\frac{7}{20}$, $b=-\frac{2}{5}$ e $a+b=-0.35-0.4-0.135-0.625-0.81$

Applicare la formula: $a+b$$=a+b$, dove $a=-\frac{3}{4}$, $b=-0.135$ e $a+b=-0.75-0.135-0.625-0.81$

Applicare la formula: $a+b$$=a+b$, dove $a=-0.885$, $b=-\frac{5}{8}$ e $a+b=-0.885-0.625-0.81$

Applicare la formula: $a+b$$=a+b$, dove $a=-1.51$, $b=-\frac{81}{100}$ e $a+b=-1.51-0.81$