Tìm x,  biết: \(\dfrac{1}{8...

B

- Hướng dẫn giải

Ta có:

\(\dfrac{1}{8} - \left( {x - \dfrac{1}{2}} \right) = \sqrt {\dfrac{1}{9}}\)

\(\begin{array}{l}\dfrac{1}{8} - \left( {x - \dfrac{1}{2}} \right) = \dfrac{1}{3}\\x - \dfrac{1}{2} = \dfrac{1}{8} - \dfrac{1}{3} = - \dfrac{5}{{24}}\\x = - \dfrac{5}{{24}} + \dfrac{1}{2}\\x = \dfrac{7}{{24}}\end{array}\)