Resposta:
Explicação passo a passo:
[tex]\frac{4}{5}-(\frac{2}{3}-\frac{1}{2} ) \\\frac{4}{5}-(\frac{2*2-3*1}{3*2})\\\frac{4}{5}-(\frac{4-3}{6})\\\frac{4}{5}-(\frac{1}{6})\\\frac{4}{5}-\frac{1}{6}\\\frac{4*6-5*1}{30}\\\frac{24-5}{30}\\\frac{19}{30}\\[/tex]
