\(x-\dfrac{1}{81}=\dfrac{2}{3}\)
\(\Leftrightarrow x=\dfrac{2}{3}+\dfrac{1}{81}=\dfrac{55}{81}\)
\(x-\dfrac{1}{81}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}+\dfrac{1}{81}\)
\(x=\dfrac{55}{81}\)
Vậy....
x - \(\dfrac{1}{81}=\dfrac{2}{3}\)
x = \(\dfrac{2}{3}+\dfrac{1}{81}\)
x = \(\dfrac{55}{81}\)