`d)bb(Đ)``bb(Ề)`

`TH1[(x^2-2xy+2y^2)(x+2y)-(x^2+4y^2)(x-y)]:2xy`

`=[x(x^2-2xy+2y^2)+2y(x^2-2xy+2y^2)-x(x^2+4y^2)+y(x^2+4y^2)]:2xy`

`=(x^3-2x^2y+2xy^2+2x^2y-4xy^2+4y^3-x^3-4xy^2+x^2y+4y^3):2xy`

`=[(x^3-x^3)+(4y^3+4y^3)+(-2x^2y+2x^2y+x^2y)+(2xy^2-4xy^2-4xy^2)]:2xy`

`=(0+0+x^2y-6xy^2+8y^3):2xy`

`=(x^2y-6xy^2+8y^3):2xy`

`=1/2x-3y+(4y^2)/x`

`TH2:[(x^2-2xy+2y^2)(x+2y)-(x^2+4y^2)(x-y)]*2xy`

`=[x(x^2-2xy+2y^2)+2y(x^2-2xy+2y^2)-x(x^2+4y^2)+y(x^2+4y^2)]*2xy`

`=(x^3-2x^2y+2xy^2+2x^2y-4xy^2+4y^3-x^3-4xy^2+x^2y+4y^3)*2xy`

`=[(x^3-x^3)+(4y^3+4y^3)+(-2x^2y+2x^2y+x^2y)+(2xy^2-4xy^2-4xy^2)]*2xy`

`=(0+0+x^2y-6xy^2+8y^3)*2xy`

`=(x^2y-6xy^2+8y^3)*2xy`

`=2x^3y^2-12x^2y^3+16xy^4`

vậy: `...`