Resposta :
Resposta:
[tex]a = + \frac{2}{5} = 0.4 \\ \\ b = - 0.3 \\ \\ c = - \frac{3}{4} = - 0.75 \\ \\ - a - b - c = \\ - 0.4 - ( - 0.3) - ( - 0.75) = \\ - 0.4 + 0.3 + 0.75 = \\ - 0.4 + 1.05 = \\ + 0.65 \: \: \: \: \:o u \: \: \: \: 0.65[/tex]
Resposta:
[tex]a = + \frac{2}{5} = 0.4 \\ \\ b = - 0.3 \\ \\ c = - \frac{3}{4} = - 0.75 \\ \\ - a - b - c = \\ - 0.4 - ( - 0.3) - ( - 0.75) = \\ - 0.4 + 0.3 + 0.75 = \\ - 0.4 + 1.05 = \\ + 0.65 \: \: \: \: \:o u \: \: \: \: 0.65[/tex]