Respostas

2014-05-30T11:36:45-03:00
Xm=(x1+x2+x3)/3
Ym=(y1+y2+y3)/3

Xm=(2+x+5)/3
2=(7+x)/3
6=7+x
-1=x

Ym=(4+5+y)/3
3=(9+y)/3
9=9+y
0=y
1 2 1