\[\left( 3\frac{2}{3}x^{2}y \right)\left( \frac{9}{11}xy^{3} \right) - 3x^{2}y^{2}\left( xy^{2} + xy \right) + 2x^{3}y^{3} =\]
\[= \frac{11 \cdot 9 \cdot x^{2}y \cdot xy^{3}}{3 \cdot 11} - 3x^{3}y^{4} - 3x^{3}y^{3} + 2x^{3}y^{3} =\]
\[= 3x^{3}y^{4} - 3x^{3}y^{4} - x^{3}y^{3} = - x^{3}y^{3}\]
\[(шестая\ степень)\]