\(\frac{3}{7}\)= \(\frac{3\cdot3}{7\cdot3}\)= \(\frac{9}{21}\)và \(\frac{2}{3}\)= \(\frac{2\cdot7}{3\cdot7}\)= \(\frac{14}{21}\)
\(\frac{9}{21}\)< \(\frac{10}{21}\)< \(\frac{11}{21}\)< \(\frac{12}{21}\)< \(\frac{13}{21}\)< \(\frac{14}{21}\)
9/21,10/21,11/21,12/21.13/21,14/21
9/21, 10/21, 11/21, 12/21