\(\frac{x}{y}\times\frac{3}{7}=\frac{4}{9}\)
\(\Rightarrow\frac{x}{y}=\frac{4}{9}:\frac{3}{7}\)
\(\Rightarrow\frac{x}{y}=\frac{28}{27}\)
\(\frac{x}{y}.\frac{3}{7}=\frac{4}{9}\)
\(\frac{x}{y}=\frac{4}{9}:\frac{3}{7}\)
\(\frac{x}{y}=\frac{4}{9}.\frac{7}{3}\)
\(\frac{x}{y}=\frac{28}{27}\)
\(\Rightarrow\hept{\begin{cases}x=28\\y=27\end{cases}}\)
vay \(\hept{\begin{cases}x=28\\y=27\end{cases}}\)
\(\frac{x}{y}x\frac{3}{7}=\frac{4}{9}\)
\(\frac{x}{y}=\frac{4}{9}:\frac{3}{7}\)
\(\frac{x}{y}=\frac{28}{27}\)
lam tiep nhe
\(x+\frac{2}{5}=\frac{1}{5}+\frac{3}{10}\)
\(x+\frac{2}{5}=\frac{2}{10}+\frac{3}{10}\)
\(x+\frac{2}{5}=\frac{5}{10}\)
\(x=\frac{5}{10}-\frac{2}{5}\)
\(x=\frac{5}{10}-\frac{4}{10}\)
\(x=\frac{1}{10}\)
vay \(x=\frac{1}{10}\)