$= x^3 - 2x^2y + 2y^2 x + 2x^2 y - 2xy^2 + 4y^3 - x^3 - 4xy^2 - x^2y - 4y^3$
$= -x^2y - 4xy^2$
$= -xy(x + 4y)$
=x3−2x2y+2y2x+2x2y−2xy2+4y3−x3−4xy2−x2y−4y3=x3−2x2y+2y2x+2x2y−2xy2+4y3−x3−4xy2−x2y−4y3
=−x2y−4xy2=−x2y−4xy2
=−xy(x+4y) học tốt
=x3−2x2y+2y2x+2x2y−2xy2+4y3−x3−4xy2−x2y−4y3=x3−2x2y+2y2x+2x2y−2xy2+4y3−x3−4xy2−x2y−4y3
=−x2y−4xy2=−x2y−4xy2
=−xy(x+4y)