$(1-2x)^2.(3x-1)=0$  
\(\left[ \begin{array}{l}(1-2x)^2=0\\3x-1=0\end{array} \right.\)  
\(\left[ \begin{array}{l}1-2x=0\\3x-1=0\end{array} \right.\) 
\(\left[ \begin{array}{l}2x=1\\3x=1\end{array} \right.\)   
\(\left[ \begin{array}{l}x=\frac12 \\x=\frac13 \end{array} \right.\)  
vậy nghiệm phương trình là {`1/2 ; 1/3`}