Answer and step-by-step explanation:
Rewrite 9 as 3^2
= 2*[tex]\sqrt[3]{3^{2} }[/tex] / 1 + [tex]\sqrt[3]{3} +\sqrt[3]{3^{2} }[/tex]
= 2*[tex]3^{\frac{2}{3} }[/tex]/ 1 + [tex]\sqrt[3]{3}[/tex] + [tex]3^{\frac{2}{3} }[/tex]
And it would be approximately 0.92
Hope this help you :3