4. Oblicz według wzoru
[tex] \sqrt[3]{9} \times \sqrt[3]{81} = \sqrt[3]{9 \times 81} = \sqrt[3]{9 \times {9}^{2} } = \sqrt[3]{ {9}^{3} } = 9[/tex]
[tex] \sqrt[3]{25 } \times \sqrt[3]{40} = [/tex]
​