Usměrni zlomek \frac{3}{\sqrt[3]{2}-1}.
=3(\sqrt[3]{4}+\sqrt[3]{3}+1)
=3(\sqrt[3]{5}+\sqrt[3]{2}+1)
=3(\sqrt[3]{4}-\sqrt[3]{2}+1)
=3(\sqrt[3]{4}+\sqrt[3]{2}+1)