`(2x - 1)^2 + (x - 3)(2x - 1) = 0 `  
`(2x - 1)(2x-1) + (x - 3)(2x - 1) = 0 `  
`(2x-1)(2x-1+x-3)=0`  
`(2x-1)(3x-4)=0`    
\(\left[ \begin{array}{l}2x-1=0\\3x-4=0\end{array} \right.\)   
\(\left[ \begin{array}{l}x=\frac{1}2\\x=\frac{4}3\end{array} \right.\)   
vậy.....  
2,` (3 - 2x)^2 + 4x^2 - 9 = 0`  
`(3-2x)(3-2x)-(9-4x^2)=0`  
` (3-2x)(3-2x)-(3-2x)(3+2x) = 0`  
`(3-2x)(3-2x-3-2x)=0`  
`-(3-2x)4x=0`  
\(\left[ \begin{array}{l}3-2x=0\\4x=0\end{array} \right.\)   
\(\left[ \begin{array}{l}x=\frac{3}2\\x=0\end{array} \right.\)