Respostas

2013-10-03T19:25:41-03:00
Xy+3xy-15x+8x
4xy-7x..........
2013-10-03T19:31:14-03:00
Xy+ 3(xy-5x) + 8x =>  xy+3xy-15x+8x  => 4xy-7x =>  x(4y-7)