{2}*\sqrt[4]{8} =\sqrt[4]{16}=2\\\frac{\sqrt[3]{54} }{\sqrt[3]{2}} =\sqrt[3]{27} =3\\(2-\sqrt[3]{6} )(4+2*\sqrt[3]{6}+\sqrt[3]{36})=(2-\sqrt[3]{6} )(4+2*\sqrt[3]{6}+\sqrt[3]{6^2})=2^3-(\sqrt[3]{6})^3=8-6=2" alt="5+\sqrt[3]{-64} =5-4=1\\4+\sqrt[4]{81} =4+3=7\\\sqrt[4]
{2}*\sqrt[4]{8} =\sqrt[4]{16}=2\\\frac{\sqrt[3]{54} }{\sqrt[3]{2}} =\sqrt[3]{27} =3\\(2-\sqrt[3]{6} )(4+2*\sqrt[3]{6}+\sqrt[3]{36})=(2-\sqrt[3]{6} )(4+2*\sqrt[3]{6}+\sqrt[3]{6^2})=2^3-(\sqrt[3]{6})^3=8-6=2" align="absmiddle" class="latex-formula">