Question

câu d cột bên phải ạ 

Answer 1

Lời giải:
\(|\sqrt{2x-2\sqrt{x^2-4}}+\sqrt{x-2}|=|\sqrt{(x-2)+(x+2)-2\sqrt{(x-2)(x+2)}}+\sqrt{x-2}|\)

\(=|\sqrt{(\sqrt{x-2}-\sqrt{x+2})^2}+\sqrt{x-2}|\)

\(||\sqrt{x+2}-\sqrt{x-2}|+\sqrt{x-2}|=|\sqrt{x+2}-\sqrt{x-2}+\sqrt{x-2}|=|\sqrt{x+2}|=\sqrt{x+2}\)