Respostas

2014-01-29T08:16:40-02:00
(x+2)/(x-1) = -2
x+2 = -2.(x-1)
x+2 = -2x + 2
x = -2x
x = 0 

(x+2)/(x-1) = 2
x+2 = 2.(x-1)
x+2 = 2x - 2
x - 2x = -2 -2
-x = -4 .(-1)
x = 4

(x+2)/(x-1) = 4
x+2 = 4.(x-1)
x+2 = 4x - 4
x - 4x = -4-2
-3x = -6 .(-1)
3x = 6
x = 6/3
x = 2

D = {0,2,4}
1 4 1