Resposta:
(9) x . (x + y³ + 4y³ - 8x + x² )
x . (x² -7x +5y³)
(10) x³ . (1 +x -x³ +4 -9x +7x³)x³ . (6x³ -8x +5)
(1) 2x³+2xy
(2) -2[tex]x^{6}[/tex] + 2[tex]x^{4}[/tex]y(3) 4x³yz
