~ Bạn tham khảo ~
`a, (-5x^3y^3z^2+2x^2y^4z^5-1/3x^2y^2z^3)÷(1/3xyz^2)`
`= -5x^3y^3z^2÷1/3xyz^2+2x^2y^4z^5÷1/3xyz^2-1/3x^2y^2z^3÷1/3xyz^2`
`= -15x^2y^2+6xy^3z^3-xyz`
`b, [5(x-2y)^4 + (x-2y)^2 + 2y-x]÷(x-2y)`
`= 5(x-2y)^4÷(x-2y) + (x-2y)^2÷(x-2y)-(x-2y)÷(x-2y)`
`= 5(x-2y)^3 + (x-2y) - 1`
`= 5(x^3-6x^2y+12xy^2-8y^3) + x-2y-1`
`= 5x^3 -30x^2y + 60xy^2-40y^3+x-2y-1`
`c, (x^3-8y^3)÷(x-2y)`
`= [x^3-(2y)^3]÷(x-2y)`
`= (x-2y)(x^2+2xy+4y^2)÷(x-2y)`
`= x^2+2xy+4y^2`