1/5=36/180
1/6=30/180
1/4=45/180
2/9=40/180
Ta co
45/180>40/180>36/180>30/180
1/4>2/9>1/5>1/6
Ta có: \(\frac{1}{5}=\frac{1.2}{5.2}=\frac{2}{10}\), \(\frac{1}{4}=\frac{1.2}{4.2}=\frac{2}{8}\)
\(\frac{1}{6}=\frac{1.2}{6.2}=\frac{2}{12}\) , \(\frac{2}{9}\)
Mà \(\frac{2}{12}< \frac{2}{10}< \frac{2}{9}< \frac{2}{8}\) nên \(\frac{1}{6}< \frac{1}{5}< \frac{2}{9}< \frac{1}{4}\)