Bài làm:
\(7\left|\frac{3}{5}x-40\%\right|-\frac{3}{5}:\frac{1}{2}=0,2\)
\(\Leftrightarrow7\left|\frac{3}{5}x-\frac{2}{5}\right|-\frac{3}{5}.2=\frac{1}{5}\)
\(\Leftrightarrow7\left|\frac{3}{5}x-\frac{2}{5}\right|=\frac{1}{5}+\frac{6}{5}\)
\(\Leftrightarrow\frac{7}{5}\left|3x-2\right|=\frac{7}{5}\)
\(\Leftrightarrow\left|3x-2\right|=1\)
\(\Leftrightarrow\orbr{\begin{cases}3x-2=1\\3x-2=-1\end{cases}\Leftrightarrow\orbr{\begin{cases}3x=3\\3x=1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=1\\x=\frac{1}{3}\end{cases}}}\)
Vậy \(x=1\)hoặc \(x=\frac{1}{3}\)
Học tốt!!!!
