Đáp án+Giải thích các bước giải:
$\displaystyle \begin{array}{{>{\displaystyle}l}} e) \ 2x^{2} +5x^{3} +x^{2} y\\ =x^{2}( 2+5x+y)\\ g) \ 14x^{2} y-21xy^{2} +28x^{2} y^{2}\\ =7xy( 2x-3y+4xy)\\ h) \ x( y-1) -y( y-1)\\ =( x-y)( y-1)\\ i) \ 10x( x-y) -8y( y-x)\\ =10x( x-y) +8y( x-y)\\ =2( x-y)( 5x+4y)\\ k) \ x^{2016} +x^{2018} +x^{2020} +x^{2022}\\ =x^{2016}\left( 1+x^{2} +x^{4} +x^{6}\right)\\ i) \ 3.x^{m+4} +5.x^{m+3} +\ x^{m+2} ,\ m\in N\\ =x^{m+2}\left( 3x^{2} +5x^{1} +1\right) \end{array}$
