a,ĐK:\(x\ge2\)
PT\(\Leftrightarrow\frac{5}{3}.\sqrt{9\left(x-2\right)}-2\sqrt{4\left(x-2\right)}=1\)
\(\Leftrightarrow\sqrt{x-2}\left(\frac{5}{3}.3-2.2\right)=1\)
\(\Leftrightarrow\sqrt{x-2}=1\Leftrightarrow x=3\left(tm\right)\)
b,ĐK:\(\forall x\in R\)
PT\(\Leftrightarrow\sqrt{x^2-6x+9}=4\Leftrightarrow x^2-6x+9=16\)
\(\Leftrightarrow x^2-6x-7=0\Rightarrow\left[{}\begin{matrix}x=7\\x=-1\end{matrix}\right.\) (tm)