Respostas

2013-12-02T11:24:04-02:00
2013-12-02T11:26:44-02:00
(3x - 6y + 4) + (4x + 2y - 2) =
3x - 6y + 4 + 4x + 2y - 2 =
3x + 4x - 6y + 2y + 4 - 2 =
7x - 4y + 2