Thu gọn đa thức 2x4y−4y5+5x4y−7y5+x2y2−2x4y2{x^4}y - 4{y^5} + 5{x^4}y - 7{y^5} + {x^2}{y^2} - 2{x^4}y2x4y−4y5+5x4y−7y5+x2y2−2x4y ta được:
Ta có:
2x4y−4y5+5x4y−7y5+x2y2−2x4y=(2x4y+5x4y−2x4y)+(−4y5−7y5)+x2y2=5x4y−11y5+x2y22x4y−4y5+5x4y−7y5+x2y2−2x4y=(2x4y+5x4y−2x4y)+(−4y5−7y5)+x2y2=5x4y−11y5+x2y2\begin{array}{l}2{x^4}y - 4{y^5} + 5{x^4}y - 7{y^5} + {x^2}{y^2} - 2{x^4}y\\ = \left( {2{x^4}y + 5{x^4}y - 2{x^4}y} \right) + \left( { - 4{y^5} - 7{y^5}} \right) + {x^2}{y^2}\\ = 5{x^4}y - 11{y^5} + {x^2}{y^2}\end{array}2x4y−4y5+5x4y−7y5+x2y2−2x4y=(2x4y+5x4y−2x4y)+(−4y5−7y5)+x2y2=5x4y−11y5+x2y22x4y−4y5+5x4y−7y5+x2y2−2x4y=(2x4y+5x4y−2x4y)+(−4y5−7y5)+x2y2=5x4y−11y5+x2y2
