Respostas

2014-02-25T20:29:36-03:00
 \frac{2}{5}  . ( -  \frac{1}{5}  \frac{1}{3} ) =

 \frac{2}{5} . (  \frac{-3+5}{15} ) =

 \frac{2}{5}  \frac{-8}{15}

 \frac{-16}{75}