$$\sqrt [ 3 ] { 8 } + \sqrt [ 3 ] { 27 } + \sqrt [ 3 ] { 64 }$$
$9$
$$2+\sqrt[3]{27}+\sqrt[3]{64}$$
$$2+3+\sqrt[3]{64}$$
$$5+\sqrt[3]{64}$$
$$5+4$$
$$9$$
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$3^{2}$
