Question

Sendo f(x)=1-x/1+x,x, calcule f(-1)+f(3)/ f(1/2)-f(2)

Answer 1

Vamos lá 
F (x) =3x-1\2x+1

F(-1)=3.(-1)-1\(-1).2+1
F(-1)-3-1\-2+1
F(-1)=.4\-1
F(-1)=4

F(-2)=3.(-2)\(-2).2+1
F(-2)=.6\4+1
F(-2)=6\-3
F(-2)=2

F(-1)+F(+2)
4+2
6