\(\sqrt{x-2}+\sqrt{4-x}=m\le\sqrt{2\left(x-2+4-x\right)}=2\Rightarrow m\le2\)
\(m\ge\sqrt{x-2+4-x}=\sqrt{2}\Rightarrow m\ge\sqrt{2}\)
\(\Rightarrow m\in\left[\sqrt{2};2\right]\)
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