Resposta e Explicação passo a passo:
[tex]a=\frac{2}{3} \\\\b=\frac{-3}{5} \\\\\:\\---------------------\\\:a-b\\\\\frac{2}{3}-\left(-\frac{3}{5}\right)=\frac{2}{3}+\frac{3}{5}=\frac{10}{15}+\frac{9}{15}=\frac{10+9}{15}=\frac{19}{15}\\\\\\\:\\---------------------\\\:a*b\\\\\frac{2}{3}\left(-\frac{3}{5}\right)=-\frac{2}{3}\cdot \frac{3}{5}=-\frac{2}{5}[/tex]
