\(x\sqrt{x}-3\sqrt{x}-x=-3\) \(\left(x\ge0\right)\)
\(\Leftrightarrow x\sqrt{x}-3\sqrt{x}-x+3=0\)
\(\Leftrightarrow\sqrt{x}\left(x-3\right)-\left(x-3\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(\sqrt{x}-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=0\\\sqrt{x}-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\) (t/m)
Vậy pt có tập nghiệm .....