Tìm x biết \(\left| - \right| - = 0\)

* Hướng dẫn giải

Ta có:

\(\begin{array}{l}\left| {\dfrac{3}{4}x - \dfrac{3}{5}} \right| - \dfrac{1}{2} = 0\\\left| {\dfrac{3}{4}x - \dfrac{3}{5}} \right| = \dfrac{1}{2}\end{array}\)

\(\begin{array}{l}TH1:\dfrac{3}{4}x - \dfrac{3}{5} = \dfrac{1}{2}\\\dfrac{3}{4}x = \dfrac{{11}}{{10}}\\x = \dfrac{{22}}{{15}}\end{array}\)

\(\begin{array}{l}TH2:\dfrac{3}{4}x - \dfrac{3}{5} = \dfrac{{ - 1}}{2}\\\dfrac{3}{4}x = \dfrac{1}{{10}}\\x = \dfrac{2}{{15}}\end{array}\)