Răspuns:
[tex] \sqrt[3]{5 \sqrt{2} + 7 } = \sqrt[3]{5 \sqrt{2} + 1 + 6 } = \sqrt[3]{6 + 2 \sqrt{2} + 1 + 3 \sqrt{2} } = \sqrt[3]{( {1 + \sqrt{2} )}^{3} } = 1 + \sqrt{2} [/tex]
