Applicare la formula: $a+b$$=a+b$, dove $a=\frac{7}{25}$, $b=-\frac{26}{25}$ e $a+b=0.28-1.04-4.2+8.6+0.65$

Applicare la formula: $a+b$$=a+b$, dove $a=-\frac{19}{25}$, $b=-\frac{21}{5}$ e $a+b=-0.76-4.2+8.6+0.65$

Applicare la formula: $a+b$$=a+b$, dove $a=\frac{43}{5}$, $b=-\frac{124}{25}$ e $a+b=-4.96+8.6+0.65$

Applicare la formula: $a+b$$=a+b$, dove $a=\frac{91}{25}$, $b=\frac{13}{20}$ e $a+b=3.64+0.65$