Bài 1 :
\(a.\sqrt{x^2-1}\)
\(ĐK:\)
\(x^2-1\ge0\)
\(\Leftrightarrow x^2\ge1\)
\(\Leftrightarrow\left[{}\begin{matrix}x\le-1\\x\ge1\end{matrix}\right.\)
Bài 2 :
\(2\cdot\sqrt{\left(\sqrt{2}-3\right)^2}+\sqrt{48}-5\sqrt{50}\)
\(=2\cdot\left|\sqrt{2}-3\right|+4\sqrt{3}-25\sqrt{2}\)
\(=-2\cdot\left(\sqrt{2}-3\right)+4\sqrt{3}-25\sqrt{2}\)
\(=-2\sqrt{2}-6+4\sqrt{3}-25\sqrt{2}\)
\(=-27\sqrt{2}-6+4\sqrt{3}\)
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