\(\frac{999}{997}-1=\frac{2}{997}\)
\(\frac{579}{577}-1=\frac{2}{577}\)
Vì \(\frac{2}{577}>\frac{2}{997}\)nên \(\frac{579}{577}>\frac{999}{997}\)
Ta có: \(\frac{999}{997}=1+\frac{2}{997};\frac{579}{577}=1+\frac{2}{577}\)
Vì \(\frac{2}{997}< \frac{2}{557}\Rightarrow\frac{999}{997}< \frac{579}{577}\)