ĐKXĐ: \(\left[{}\begin{matrix}x\ge5\\x< -5\end{matrix}\right.\)
- Với \(x\ge5\)
\(\Leftrightarrow\sqrt{x-5}\left(\frac{2x-1}{\sqrt{x+5}}-3\sqrt{x+5}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=5\\2x-1=3\left(x+5\right)\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-16\left(l\right)\end{matrix}\right.\)
- Với \(x< -5\)
\(\Leftrightarrow\sqrt{5-x}\left(\frac{2x-1}{\sqrt{-x-5}}-3\sqrt{-x-5}\right)=0\)
\(\Leftrightarrow2x-1=3\left(-x-5\right)\)
\(\Leftrightarrow5x=-14\Rightarrow x=-\frac{14}{5}>-5\left(l\right)\)
Vậy pt có nghiệm duy nhất \(x=5\)
b/ Với \(x< 1\) pt vô nghiệm
Với \(x\ge1\)
\(\Leftrightarrow\left(3x-1\right)\left(3x^2-4x+1\right)=\left(x-1\right)^2\)
\(\Leftrightarrow\left(3x-1\right)^2\left(x-1\right)-\left(x-1\right)^2=0\)
\(\Leftrightarrow\left(x-1\right)\left(\left(3x-1\right)^2-x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\\left(3x-1\right)^2-x+1=0\left(1\right)\end{matrix}\right.\)
\(\left(1\right)\Leftrightarrow9x^2-7x+2=0\) (vô nghiệm)
Vậy pt có nghiệm duy nhất \(x=1\)
