Răspuns :
[tex] | \sqrt{2} - 1 | + \sqrt{(1 - 2 \sqrt{2}) {}^{2} } + 2 = \\ \sqrt{2} - 1 + |1 - 2 \sqrt{2} | + 2 = \\ \sqrt{2} - 1 + 2 \sqrt{2} - 1 + 2 = \\ 3 \sqrt{2} - 1 - 1 + 2 = \\ 3 \sqrt{2} [/tex]
[tex] | \sqrt{2} - 1 | + \sqrt{(1 - 2 \sqrt{2}) {}^{2} } + 2 = \\ \sqrt{2} - 1 + |1 - 2 \sqrt{2} | + 2 = \\ \sqrt{2} - 1 + 2 \sqrt{2} - 1 + 2 = \\ 3 \sqrt{2} - 1 - 1 + 2 = \\ 3 \sqrt{2} [/tex]