Question

alternativas:
a.
$\frac{0.8 + x}{4}$
b.
$\frac{0.8 - x}{4}$
c.
$0.8 \ - \frac{x}{4}$
d.
$0.8 \ + \ \frac{x}{4}$

Answer 1

(0,8+x).(0,8-x)
___________=
4(0,8+x)

0,8 - x
______=
4

resposta item b)