\[\boxed{\text{439\ (439).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \left( x^{6} \right)^{4} = x^{6 \cdot 4} = x^{24}\]
\[\textbf{б)}\ x^{6} \cdot x^{4} = x^{6 + 4} = x^{10}\]
\[\textbf{в)}\ x^{2} \cdot x^{2} = x^{2 + 2} = x^{4}\]
\[\textbf{г)}\ \left( x^{2} \right)^{2} = x^{2 \cdot 2} = x^{4}\]
\[\textbf{д)}\ x^{2} \cdot x^{3} \cdot x^{4} = x^{2 + 3 + 4} = x^{9}\]
\[\textbf{е)}\ \left( \left( x^{2} \right)^{3} \right)^{4} = x^{2 \cdot 3 \cdot 4} = x^{24}\]