Tìm x biết: \(0,2 + \dfrac{...

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- Hướng dẫn giải

Ta có:

\(0,2 + \dfrac{2}{3}x = \dfrac{1}{3}\)

\(\begin{array}{l}\dfrac{2}{3}x = \dfrac{1}{3} - 0,2\\\dfrac{2}{3}x = \dfrac{1}{3} - \dfrac{1}{5}\\\dfrac{2}{3}x = \dfrac{2}{{15}}\\x = \dfrac{2}{{15}}:\dfrac{2}{3}\\x = \dfrac{1}{5}\end{array}\)