\(\dfrac{\sqrt{x-1}}{x^2}\)
ĐKXĐ: \(\left\{{}\begin{matrix}x-1\ge0\\x^2\ne0\end{matrix}\right.\Leftrightarrow x\ge1\)
\(\sqrt{\dfrac{x}{\left(x-1\right)^2}}\)
ĐKXĐ: \(\left\{{}\begin{matrix}x\ge0\\x-1\ne0\end{matrix}\right.\) \(\Leftrightarrow x\ge0\)
\(\sqrt{x+5}-\sqrt{2x+1}\)
ĐKXĐ:\(\left\{{}\begin{matrix}x+5\ge0\\2x+1\ge0\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x\ge-5\\x\ge\dfrac{-1}{2}\end{matrix}\right.\)\(\Leftrightarrow x\ge\dfrac{-1}{2}\)
\(\sqrt{3-x^2}\)
ĐKXĐ: \(3-x^2\ge0\Leftrightarrow x\le\pm\sqrt{3}\)
\(\dfrac{\sqrt{x-1}}{x^2}\)
đkxđ :\(\left\{{}\begin{matrix}x-1\ge0\\x^2\ne0\end{matrix}\right.\)\(\Leftrightarrow x\ge1\)
\(\sqrt{\dfrac{x}{\left(x-1\right)^2}}\)
ĐKXĐ:\(\left\{{}\begin{matrix}x\ge0\\\left(x-1\right)^2\ne0\end{matrix}\right.\)