\(\dfrac{65}{5}=13;24< \dfrac{5678}{234}< 25;\dfrac{456789}{5}=91357,8\)
Do đó: \(1< \dfrac{65}{5}< \dfrac{5678}{234}< \dfrac{456789}{5}\left(1\right)\)
\(\dfrac{6}{7}=\dfrac{6\cdot9}{7\cdot9}=\dfrac{54}{63};\dfrac{5}{9}=\dfrac{5\cdot7}{9\cdot7}=\dfrac{35}{63}\)
mà 54>35
nên \(1>\dfrac{6}{7}>\dfrac{5}{9}\)(2)
Từ (1),(2) suy ra \(\dfrac{5}{9}< \dfrac{6}{7}< \dfrac{65}{5}< \dfrac{5678}{234}< \dfrac{456789}{5}\)