`a,[5(x-y)^4-3(x-y)^3-4(x-y)^2]:(x-y)`
`=5(x-y)^3-3(x-y)^2-4(x-y)`
`b,(9xy^2-6x^2y)(-3xy)+(6x^2y+2x^4):(x+y)^3`
`=-27x^2y^3+18x^3y^2+(6x^2y+2x^4):(x+y)^3`
vẫn ko hiểu
`c,(x^2-2xy+y^2):(x-y)`
`=(x-y)^2:(x-y)`
`=x-y`
`d, (27x^3+1):(9x^2-3x+1)`
`= (3x+1)(9x^2-3x+1):(9x^2-3x+1)`
`= 3x+1`