\[\boxed{\text{622\ (622).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[если\ x = 3:\]
\[3 \cdot 3^{2} - 11 \cdot 3 = 27 - 33 = - 6.\]
\[если\ x = - 3:\]
\[3 \cdot ( - 3)^{2} - 11 \cdot ( - 3) =\]
\[= 27 + 33 = 60.\]
\[\textbf{б)}\ \ x(x - y) - y\left( y^{2} - x \right) =\]
\[если\ x = 4;\ \ y = 2:\ \ \]
\[4^{2} - 2^{3} = 16 - 8 = 8.\ \]