Applicare la formula: $a+b$$=a+b$, dove $a=\frac{13}{10}$, $b=-\frac{1}{2}$ e $a+b=1.3-0.5+1$

Applicare la formula: $a+b$$=a+b$, dove $a=\frac{5}{4}$, $b=-\frac{3}{5}$ e $a+b=-0.6+1.25$

Applicare la formula: $a+b$$=a+b$, dove $a=\frac{4}{5}$, $b=1$ e $a+b=0.8+1$

Applicare la formula: $a^b$$=a^b$, dove $a=\frac{9}{5}$, $b=\frac{1}{2}$ e $a^b=\sqrt{1.8}$

Applicare la formula: $ab$$=ab$, dove $ab=1.3416408\cdot 0.65$, $a=\frac{3}{\sqrt{5}}$ e $b=\frac{13}{20}$