Question

$\frac{4}{5}$·(3+0,4)-3,21

Answer 1

Oi :)

$\frac{4}{5}(3+0,4)-3,21 \\ \\ \frac{4}{5}(3,4)-3,21 \\ \\ \frac{13,6}{5}-3,21 \\ \\ 2,72-3,21=\boxed{-0,49} \ ou \  \boxed{-\frac{49}{100} }$