ĐKXĐ: \(x\ge1\)
\(M=\sqrt{x-\sqrt{x^2-4x+4}}\)
\(=\sqrt{x+\sqrt{\left(x-2\right)^2}}\)
(+) \(x-2\ge0\Leftrightarrow x\ge2\)
\(M=\sqrt{x+x-2}=\sqrt{2x-2}\)
(+) \(x-2< 0\Leftrightarrow1\le x< 2\)
\(M=\sqrt{x+2-x}=\sqrt{2}\)
a,DKXĐ
\(x>0\)
b,\(\sqrt{x-\sqrt{x^2-4x+4}}=\sqrt{x-\sqrt{\left(x-2\right)^2}}=\sqrt{x-x+2}=\sqrt{2}\)