Question

thu gọn:5x^4-3x^3y+2xy^3-x^3y+2y^4-7x^2y^2-2x^3

Answer 1

5x^4-3x^3y+2xy^3-x^3y+2y^4-7x^2y-2x^3

= 5x^4+(3x^3y-x^3y)+2xy^3+2y^4-7x^2y-2x^3

=5x^4+2x^3y+2xy^3+2y^4-7x^2y-2x^3

 

Answer 2

\(5x^4-3x^3y+2xy^3-x^3y+2y^4-7x^2y^2-2x^3\)

\(=5x^4+\left(-3x^3y-x^3y\right)+2xy^3+2y^4-7x^2y^2-2x^3\)

\(=5x^4-4x^3y+2xy^3+2y^4-7x^2y^2-2x^3\)