Bài 4:
a, ⇒$\frac{3}{5}$.x=$\frac{5}{14}$
⇒x=$\frac{25}{42}$
b, ⇒|3x-1|=2
⇒\(\left[ \begin{array}{l}3x-1=2\\3x-1=-2\end{array} \right.\) ⇒ \(\left[ \begin{array}{l}3x=3\\3x=-1\end{array} \right.\) ⇒ \(\left[ \begin{array}{l}x=1\\x=-1/3\end{array} \right.\)
Vậy x=1, x=-1/3
c, (1-2x)²=9
⇒(1-2x)²=3²
⇒1-2x=3
⇒2x=-2
⇒x=-1
(Học tốt nhé!)
