Respuesta

A)

Resolviendo obtenemos:

$-1,80\cdot {\displaystyle \frac{5}{8}}+1,80\cdot {\displaystyle \frac{-3}{8}}=-1{\displaystyle \frac{4}{5}}\cdot {\displaystyle \frac{5}{8}}+1{\displaystyle \frac{4}{5}}\cdot {\displaystyle \frac{-3}{8}}={\displaystyle \frac{-9}{5}}\cdot {\displaystyle \frac{5}{8}}+{\displaystyle \frac{9}{5}}\cdot {\displaystyle \frac{-3}{8}}={\displaystyle \frac{-9}{8}}+{\displaystyle \frac{-27}{40}}=$

$⟹{\displaystyle \frac{-45}{40}}+{\displaystyle \frac{-27}{40}}={\displaystyle \frac{-72}{40}}=-1{\displaystyle \frac{32}{40}}=-1{\displaystyle \frac{4}{5}}=-1,8$

El resultado es $-1,80$.