\(\left(\dfrac{1}{2}+2x\right)\left(2x-3\right)=0\\ \Rightarrow\left[{}\begin{matrix}\dfrac{1}{2}+2x=0\\2x-3=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}2x=-\dfrac{1}{2}\\2x=3\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{1}{4}\\x=\dfrac{3}{2}\end{matrix}\right.\)
(1/2+2x).(2x-3)=0
=>1/2+2x =0
hoặc 2x-3=0
(+)1/2+2x=0
2x=0-1/2
2x=-1/2
x=-1/2:2
x=-1/4
(+)2x-3=0
2x =0+3
2x =3
x =3:2
x =3/2
vậy x€{-1/4;3/2}