Đáp án:
Giải thích các bước giải:
a) |3x + 5| = 5
\(\left[ \begin{array}{l}3x+5=5\\3x+5=-5\end{array} \right.\)
\(\left[ \begin{array}{l}3x=0\\3x=-10\end{array} \right.\)
\(\left[ \begin{array}{l}x=0\\x=$\frac{-10}{3}$ \end{array} \right.\)
b) |5x -1| - 2x = 7
|5x -1| = 2x -7
\(\left[ \begin{array}{l}5x-1=2x-7\\5x-1=-2x+7\end{array} \right.\)
\(\left[ \begin{array}{l}3x=6\\7x=8\end{array} \right.\).
\(\left[ \begin{array}{l}x=2\\x=$\frac{-7}{8}$ \end{array} \right.\)
c)
