11.
[tex]a) \ 5(\sqrt[3]{4})^{3} = 5\cdot4 = 20\\\\b) \ 4\sqrt[3]{5}\cdot\sqrt[3]{5}\cdot\sqrt[3]{5} = 4\cdot(\sqrt[3]{5})^{3} = 4\cdot5 = 20\\\\c) \ (\sqrt[3]{6})^{2}\cdot2\sqrt[3]{6} = 2\cdot(\sqrt[3]{6})^{3} = 2\cdot6 = 12\\\\d) \ 2\sqrt[3]{7}\cdot5\sqrt[3]{7} = 10\cdot(\sqrt[3]{7})^{3} = 10\cdot7 = 70\\\\e) \ -3\sqrt[3]{2}\cdot5\sqrt[3]{2}\cdot\sqrt[3]{2} = -15\cdot(\sqrt[3]{2})^{3} = -15\cdot2 = -30\\\\f) \ -4(\sqrt[3]{5})^{2}\cdot(-2)\sqrt[3]{5} = 8\cdot(\sqrt[3]{5})^{3} = 8\cdot5 = 40[/tex]
