Câu 1 :
a ) 2 |1/2x - 1/3 | -3/2 = 1/4
⇒ 2| 1/2x - 1/3 | = 1/4 + 3/2
⇒ 2| 1/2x - 1/3 | = 7/4
⇒ |1/2x - 1/3 | = 7/4 : 2 = 7/2
⇒ \(\left[ \begin{array}{l}1/2x- 1/3 = 7/2 \\1/2x - 1/3 = -7/2\end{array} \right.\)
⇒ \(\left[ \begin{array}{l}1/2x= 7/2 + 1/3=23/6 \\1/2x=-7/2 + 1/3= -19/6\end{array} \right.\)
⇒\(\left[ \begin{array}{l}x=23/6 : 1/2= 23/3 \\x=-19/6 : 1/2 = -19/3\end{array} \right.\)
Vậy x = 23/3 hoặc x = -19/3
