Respostas

2013-11-05T18:00:22-02:00
X-3=Y
X^2 -2XY+Y^2
X^2-2X(X-3)+(X-3)^2
X^2-2X^2+6X+X^2-9
6X-9=0
X=9/6
X=3/2
1 5 1