1) $$ \sqrt[3]{2ab} \cdot \sqrt[3]{4a^2b} = \sqrt[3]{2ab \cdot 4a^2b} = \sqrt[3]{8a^3b^2} = \sqrt[3]{2^3a^3b^2} = 2a\sqrt[3]{b^2} $$
Ответ: $$2a\sqrt[3]{b^2} $$