Respostas

2014-04-21T11:31:39-03:00
2xy+3xz-4xw+5x-2xy+10xy-10w-5x+15x
10xy+18xz+10w-4xw
x(10y+18z) + w(10-4x)
2x(5y+9z) + 2w(5-4x)
2(x(5y+9z) + w(5-4x))