\(\Leftrightarrow\left|5x-\dfrac{2}{5}\right|=\dfrac{3}{5}\)
=>5x-2/5=3/5 hoặc 5x-2/5=-3/5
=>5x=1 hoặc 5x=-1/5
=>x=1/5 hoặc x=-1/25
\(\left|-5x+\dfrac{2}{5}\right|=\left|\dfrac{1}{15}-\dfrac{2}{3}\right|\)
\(\Leftrightarrow\left|-5x+\dfrac{2}{5}\right|=\left|-\dfrac{3}{5}\right|\)
\(\Leftrightarrow\left|-5x+\dfrac{2}{5}\right|=\dfrac{3}{5}\)
\(\Leftrightarrow\left[{}\begin{matrix}-5x+\dfrac{2}{5}=\dfrac{3}{5}\\5x-\dfrac{2}{5}=\dfrac{3}{5}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}-5x=\dfrac{1}{5}\\5x=1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{25}\\x=\dfrac{1}{5}\end{matrix}\right.\)
`|-5x+2/5|=|1/15-2/3|`
` | -5x + 2/5| = |-3/5|`
`|-5x + 2/5| = 3/5`
`TH1)`
`=> 5x + 2/5 = 3/5`
`=> 5x = 1`
`=> x = 1/5`
`TH2)`
`5x + 2/5 = -3/5`
`=> 5x = -1
`=> 5x = 1/5`
`=> x = 1/5 : 5`
`=> x = 1/25`
_______________________________
`#BaoL i n h`
