Applicare la formula: $a+b$$=a+b$, dove $a=\frac{23}{10}$, $b=\frac{28}{5}$ e $a+b=2.3+5.6+\frac{3}{4}$

Applicare la formula: $\frac{a}{b}+c$$=\frac{a+cb}{b}$, dove $a/b+c=7.9+\frac{3}{4}$, $a=3$, $b=4$, $c=\frac{79}{10}$ e $a/b=\frac{3}{4}$

Applicare la formula: $ab$$=ab$, dove $ab=7.9\cdot 4$, $a=\frac{79}{10}$ e $b=4$

Applicare la formula: $a+b$$=a+b$, dove $a=3$, $b=\frac{158}{5}$ e $a+b=3+31.6$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=\frac{173}{5}$, $b=4$ e $a/b=\frac{34.6}{4}$