Question

me ajudem, por favor! (vale 10 pontos)

Answer 1

.a+b=
$-0,6+ \frac{15}{10} + \frac{8}{5} -3= \\ \\ - \frac{6}{10} + \frac{15}{10} + \frac{8}{5} -3= \\ \\ mmc(10,5)=10 \\ \\ \frac{-6+15+16-30}{10} = \\ \\ \frac{-36+31}{10} = \\ \\ - \frac{5}{10} ~~ ou~~-0,5$