\[\boxed{\text{324\ (324).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[*\ = - 3x^{2} - 5x^{2}\text{y.}\]
\[*\ = - 3x^{2} - 5x^{2}y - 7x.\]
\[*\ = - 5x^{2}y + 8y.\]
\[\boxed{\text{324.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ ( - 8)^{5} \cdot ( - 8)^{4} < ( - 8)^{8}\]
\[- 8^{9} < 8^{8}\]
\[2)\ ( - 6)^{3} \cdot ( - 6)^{9} > ( - 6)^{13}\]
\[6^{12} > ( - 6)^{13}\]