Respostas

2014-05-15T15:03:41-03:00
(3+XY) - (-XY) +(XY)=
(3+XY) +XY +XY=
3+XY +XY +XY=
3+ 3XY=
3XY= -3
XY = -3/3
XY = - 1
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A melhor resposta!
2014-05-15T15:05:02-03:00
(3+xy)-(-xy)+(xy)
3 + xy +xy + xy
3 + 3xy


Obs; ( -  *  - = +)
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