Respostas

2014-05-19T21:51:56-03:00
 ( 3x+2y) . (y -3x)
3xy - 9x² +2y² - 6xy
1 5 1
2014-05-19T22:42:04-03:00
3xy -9x^2+2Y^2-6xy =-3xy-9x^2+2y^2