Question

Quanto é?
- 2/5 - ( - 1/2 + 3/2)

Answer 1

Resposta:

$- \frac{2}{5} - ( - \frac{1}{2} + \frac{3}{2} ) = \\ \\ - \frac{2}{5} + \frac{1}{2} - \frac{3}{2} = \\ \\ - \frac{2}{5} + \frac{1 - 3}{2} = \div \\ - \frac{2}{5} + \frac{ - 2}{2} = \\ \\ - \frac{2}{5} - 1 = \\ \\ - \frac{2 + 5}{5} = \\ \\ - \frac{7}{5}$