Resposta:
5
[tex] \sqrt{2 \times \sqrt( {12}^{2} + {5}^{2}) - {5}^{0} } \\ \sqrt{2 \times \sqrt( {144} + {25}) - {5}^{0} } \\ \sqrt{2 \times \sqrt( {169}) - {5}^{0} } \\ \sqrt{2 \times {13} - {5}^{0} } \\ \sqrt{2 \times {13} - 1 } \\ \sqrt{26 - 1} \\ \sqrt{25} \\ = 5[/tex]
