Nhân đa thức vs Đa thức giúp em vs anh chị ơi

B

buithihuong2410

1/$x^3 - x^2 - 2x^2+2x+x-1 =x^3-3x^2+3x-1$
b/$5x^3-x^4-10x^2+2x^3+5x-x^2+5-x=7x^3-x^4-11x^2-4x+5$

2/$x^3.y^2-2x^2.y^3-1/2.x^2.y+xy^2+2xy-2y^2$
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