Question

1-Resolva

a)
$( + \frac{8}{5} ) + \div ( - 2) - 3 \times ( - \frac{1}{4} )$
b)
$( - 5.6) \div ( - 2.8) - ( - 0.5)$

Answer 1

Boa tarde

a)

(8/5)/2  - 3*1/4 = 8/10 - 3/4 = 4/5 - 3/4 = 16/20  - 15/20 = 1/20 

b)

(-56/10)/(-28/10) - (-1/2 = 1 + 1/2 = 3/2