=>2x+1/2=0 hoặc 2x-3=0
=>x=-1/4 hoặc x=3/2
\(\left[{}\begin{matrix}\dfrac{1}{2}+2x=0\\2x-3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=-\dfrac{1}{2}\\2x=3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{4}\\x=\dfrac{3}{2}\end{matrix}\right.\)
( 1/2 + 2x ) ( 2x - 3 ) = 0
( 1/2 + 2x ) = 0
( 2x - 3 ) = 0
( 1/2 + 2x ) = 0
\(\Leftrightarrow\) ( 2x + 1/2 ) = 0
2x + 1/2 - 1/2 = 0 - 1/2
2x = -1/2
2x/2 = -1/2 : 2
x = -1/4
2x - 3 = 0
2x - 3 + 3 = 0 + 3
2x = 3
2x/2 = 3/2
x = 3/2
\(\Rightarrow\) x1 = -1/4 ; x2 = 3/2
