Respostas

2013-06-05T19:42:53-03:00

Primeiro iremos achar f(-1/2), onde há x, colocaremos -1/2 f(-1/2)=\frac{-1}{4} - \frac{2}{3} => \frac{-3-8}{12} => \frac{-11}{12}

E com x = 2/3 f(2/3)=\frac{2}{6} - \frac{2}{3} => \frac{2-4}{6} => \frac{-2}{6}=> \frac{-1}{3}

 \frac{-11}{12}+\frac{-1}{3} => \frac{-11-4}{12} => \frac{-15}{12}=> \frac{-5}{4}

 

Resposta letra b) -5/4

1 5 1