Applicare la formula: $a+b$$=a+b$, dove $a=16.15$, $b=-4$ e $a+b=-24\cdot \left(\frac{1}{2}\right)+16.15-4$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=2$, $c=-24$, $a/b=\frac{1}{2}$ e $ca/b=-24\cdot \left(\frac{1}{2}\right)$

Applicare la formula: $ab$$=ab$, dove $ab=-24\cdot 1$, $a=-24$ e $b=1$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=-24$, $b=2$ e $a/b=-\frac{24}{2}$

Applicare la formula: $a+b$$=a+b$, dove $a=12.15$, $b=-12$ e $a+b=-12+12.15$