Resposta :

[tex]8\sqrt{x^{3}}+\sqrt{x^{3}} \\\\ 8\sqrt{x^{3}}+1\sqrt{x^{3}} = 9\sqrt{x^{3}}[/tex]

[tex]9\sqrt{x^{3}} = 9\sqrt{x^{2} \cdot x} = 9 \cdot x \sqrt{x} = \boxed{\boxed{9x\sqrt{x}}}[/tex]

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