Odpowiedź:
[tex]\sqrt[3]{\frac{7}{3} } \cdot \sqrt[3]{\frac{81}{56} } =\sqrt[3]{\frac{7}{3} \cdot \frac{81}{56} }= \sqrt[3]{\frac{7}{3} \cdot \frac{3^4}{56} } =\sqrt[3]{\frac{7 \cdot 3^3}{56} } =\frac{\sqrt[3]{3} \cdot \sqrt[3]{7} }{\sqrt[3]{2^3 \cdot 7} } =\frac{3\sqrt[3]{7} }{2\sqrt[3]{7} } =\frac{3}{2}[/tex]
[tex]\sqrt[n]{a} \cdot \sqrt[n]{b} =\sqrt[n]{a \cdot b}[/tex]
[tex]\sqrt[n]{\frac{a}{b} } =\frac{\sqrt[n]{a} }{\sqrt[n]{b} }[/tex]
