x = 5/3
lm nhanh thôi!
\(x.\frac{1}{5}=1-\frac{2}{3}\)
\(x.\frac{1}{5}=\frac{3}{3}-\frac{2}{3}=\frac{1}{3}\)
\(x=\frac{1}{3}.5=\frac{5}{3}\)
\(x\times\frac{1}{5}=1-\frac{2}{3}\)
\(x\times\frac{1}{5}=\frac{1}{3}\)
\(x=\frac{1}{3}\div\frac{1}{5}\)
\(x=\frac{5}{3}.\)