Respostas

2013-11-28T07:39:18-02:00
(5+7):2, 1+(-9)):2
12:2,     -8:2
Pm=   (6,-4)
2013-11-28T09:37:25-02:00
MAB = (xA+xB)/2 , (yA+yB)/2
MAB = (5+7)/2 , (1-9)/2
MAB = 12/2 , -8/2
MAB = (6, -4)