Question

8/12 - 3 + 5/15 por favor é pra amanhã

Answer 1

$mmc \: de \: 12 \: e \: 15 \\ 2 \times 2 \times 3 \times 5 = 60$
$\frac{8}{12} = 60 \div 12 \times 8 = 40 \\ \frac{40}{60}$
$- 3 = 60 \times - 3 = - 180 \\ \frac{ - 180}{60}$
$\frac{5}{15} = 60 \div 15 \times 5 = 20 \\ \frac{20}{60}$
$\frac{40}{60} - \frac{180}{60} + \frac{20}{60} = \frac{ - 120}{60} = - 2$