A)
[tex]ab {}^{2} + b - ab + a - ab {}^{2} + ab[/tex]
[tex] {ab}^{2} - ab {}^{2} + b - ab + ab + a[/tex]
[tex]b + a[/tex]
B)
[tex] {3x}^{2} - 2x + y {}^{2} - 2x {}^{2} + 4xy + {x}^{3} - y {}^{2} + 8x - 2xy[/tex]
[tex]3x {}^{3} + x {}^{3} - 2x + 8x + y {}^{2} - {y}^{2} - 2x {}^{2} + 4xy - 2xy[/tex]
[tex]4x {}^{ 3} + 6x - 2x {}^{2} + 2xy[/tex]
Espero ter ajudado!
