Answer :

[tex]\sqrt[3]{\sqrt{324}}=\sqrt[3]{\sqrt{18^2}}=\sqrt[3]{18}\approx2.6207\\\\\sqrt[3]{\sqrt{324}}=\sqrt[6]{324}[/tex]
[tex]\sqrt[3]{\sqrt{324}}=\sqrt[3]{18}\approx 2.62[/tex]

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