Question

giúp mình với

Answer 1

\(=\sqrt{\sqrt{2}+1-\sqrt{8\left(\sqrt{2}+1\right)}+2}-\sqrt{\sqrt{2}+1}\)
\(=\left|\sqrt{\sqrt{2}+1}-\sqrt{2}\right|-\sqrt{\sqrt{2}+1}\)
\(=\sqrt{\sqrt{2}+1}-\sqrt{2}-\sqrt{\sqrt{2}+1}=-\sqrt{2}\)