Nhóm 1: \(\dfrac{5}{2}x^2y;-\dfrac{1}{2}x^2y;x^2y;-\dfrac{2}{5}x^2y\)
Nhóm 2: \(xy^2;-2xy^2;\dfrac{1}{4}xy^2\)
` nhóm ``1: 5/3x^2 y;-1/2x^2 y; x^2 y:-2/5 x^2y`
` nhóm ` `2:xy^2;-2xy^2;1/4 xy^2`
` nhóm ` `3:xy`
` 5/3 x^2y; x^2y; -1/2 x^2y; -2/5 x^2y`
` xy^2; -2xy^2; 1/4xy^2`
` xy`