\(\left(x-1\right)\left(x-2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\x-2=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
Vậy \(x=\left\{1;2\right\}\)
x-1=0 hoặc x-2=0
x=1 hoặc x=2
vậy x=1 hoặc x=2