`#huy`
`h)2x(x-2)-(2-x)^2=0`
`<=>2x.(x-2)-(2-x).(2-x)=0`
`<=>2x.(x-2)+(x-2).(2x-x)=0`
`<=>(x-2).(2x+2-x)=0`
`<=>(x-2).(x+2)=0`
`<=>`\(\left[ \begin{array}{l}x-2=0\\x+2=0\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}x=2\\x=-2\end{array} \right.\)
`i)(x-3)^3+3-x=0`
`<=>(x-3)^3-(x-3)=0`
`<=>(x-3)[(x-3)^2-1]=0`
`<=>(x-3).(x-3-1).(x-3+1)=0`
`<=>`\(\left[ \begin{array}{l}x-3=0\\x-4=0\\x-2=0\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}x=3\\x=4\\x=2\end{array} \right.\)
