Question

\(\sqrt{\dfrac{5}{x^2+3}}\)

Answer 1

Đề là gì

Answer 2

ĐKXĐ: \(\left\{{}\begin{matrix}\dfrac{5}{x^2+3}\ge0\\x^2+3\ne0\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}\left\{{}\begin{matrix}5\le0\left(vôlí\right)\\x^2+3< 0\end{matrix}\right.\\\left\{{}\begin{matrix}5\ge0\\x^2+3>0\end{matrix}\right.\end{matrix}\right.\\x^2+3\ne0\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}x^2+3>0\\x^2+3\ne0\end{matrix}\right.\)\(\Rightarrow x^2+3>0\)

Answer 3

ĐKXĐ: \(x\in R\)