Question

calcule o valor das expressões numéricas:

(-4/5):(8/5)-(+2)(-5/4)=

5/4.(-4/9)+2.(+1/4)=

Answer 1

Resposta:

$(\frac{-4}{5}):(\frac{8}{5}) -(+2)(\frac{-5}{4} ) = (\frac{-4}{5} ) . (\frac{5}{8} ) -(+2)(\frac{-5}{4})$

Simplificamos as expressões

-1. $\frac{1}{2}$ - (+2) ( -$\frac{5}{4}$)

- 1. $\frac{1}{2}$ + $\frac{10}{4}$

$\frac{-1}{2} + \frac{10}{4} = \frac{-2 + 10}{4} = \frac{8}{4}  = 2$