\(\left(\dfrac{5}{6}-\dfrac{2}{5}x\right):\dfrac{1}{4}=-\dfrac{1}{5}\)
\(\dfrac{5}{6}-\dfrac{2}{5}x=-\dfrac{1}{5}.\dfrac{1}{4}\)
\(\dfrac{5}{6}-\dfrac{2}{5}x=-\dfrac{1}{20}\)
\(\dfrac{2}{5}x=\dfrac{5}{6}+\dfrac{1}{20}\)
\(\dfrac{2}{5}x=\dfrac{53}{60}\)
\(x=\dfrac{53}{60}:\dfrac{2}{5}\)
=> \(x=\dfrac{53}{24}\)
\(\left(\dfrac{5}{6}-\dfrac{2}{5}x\right):\dfrac{1}{4}=\dfrac{-1}{5}\Leftrightarrow\dfrac{5}{6}-\dfrac{2}{5}x=\dfrac{-1}{20}\Leftrightarrow\dfrac{2}{5}x=\dfrac{53}{60}\Leftrightarrow x=\dfrac{53}{24}\)
\(\left(\dfrac{5}{6}-\dfrac{2}{5}x\right):\dfrac{1}{4}=-\dfrac{1}{5}\)
\(\dfrac{5}{6}-\dfrac{2}{5}x=-\dfrac{1}{5}.\dfrac{1}{4}\)
\(\dfrac{5}{6}-\dfrac{2}{5}x=-\dfrac{1}{20}\)
\(\dfrac{2}{5}x=\dfrac{5}{6}+\dfrac{1}{20}\)
\(\dfrac{2}{5}x=\dfrac{53}{60}\)
\(x=\dfrac{53}{60}:\dfrac{2}{5}=\dfrac{53}{24}\)
Vậy :...
(\(\dfrac{5}{6}-\dfrac{2}{5}x=-\dfrac{1}{5}.\dfrac{1}{4}\)
\(\dfrac{5}{6}-\dfrac{2}{5}x=-\dfrac{1}{20}\)
\(\dfrac{2}{5}x=\dfrac{5}{6}-\left(-\dfrac{1}{20}\right)\)
\(\dfrac{2}{5}x=\dfrac{5}{6}+\dfrac{1}{20}\)
\(\dfrac{2}{5}x=\dfrac{50}{60}+\dfrac{3}{60}\)
\(\dfrac{2}{5}x=\dfrac{53}{60}\)
\(x=\dfrac{53}{60}:\dfrac{2}{5}\)
\(x=\dfrac{53}{60}.\dfrac{5}{2}\)
\(x=\dfrac{53}{24}\)
