Question

\(|3x-\dfrac{3}{5}|-0,2=\dfrac{1}{4}\)

Answer 1

`|3x - 3/5| - 0,2 = 1/4`

`|3x - 0,6| = 0,45`

`=>` \(\left[{}\begin{matrix}3x-0,6=0,45\\3x-0,6=-0,45\end{matrix}\right.\)

`<=>` \(\left[{}\begin{matrix}x=\dfrac{7}{20}\\x=\dfrac{1}{20}\end{matrix}\right.\)

Answer 2

=>|3x-3/5|=1/4+1/5=9/20

=>3x-3/5=9/20 hoặc 3x-3/5=-9/20

=>3x=21/20 hoặc 3x=3/20

=>x=7/20 hoặc x=1/20

Answer 3

\(\left|3x-\dfrac{3}{5}\right|-0,2=\dfrac{1}{4}\\ \Leftrightarrow\left|3x-\dfrac{3}{5}\right|-\dfrac{1}{5}=\dfrac{1}{4}\\ \Leftrightarrow\left|3x-\dfrac{3}{5}\right|=\dfrac{9}{20}\\ \Leftrightarrow\left[{}\begin{matrix}3x-\dfrac{3}{5}=\dfrac{9}{20}\\3x-\dfrac{3}{5}=-\dfrac{9}{20}\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{7}{20}\\x=\dfrac{1}{20}\end{matrix}\right.\)