Lời giải:
\((x^2-x-1)(x^2-x-2)=0\)
\(\Rightarrow \left[\begin{matrix} x^2-x-1=0\\ x^2-x-2=0\end{matrix}\right.\)
Nếu $x^2-x-1=0$
$\Leftrightarrow 4x^2-4x-4=0$
$\Leftrightarrow (2x-1)^2=5$
$\Rightarrow 2x-1=\pm \sqrt{5}\Rightarrow x=\frac{1\pm \sqrt{5}}{2}$
Nếu $x^2-x-2=0$
$\Leftrightarrow 4x^2-4x-8=0$
$\Leftrightarrow (2x-1)^2=9$
$\Rightarrow 2x-1=\pm 3\Rightarrow x=-1$ hoặc $x=2$
Vậy......