18/63 và 28/63
18/63 và 28/63
25/40 và 64/40
84/96 và 88/96
\(\dfrac{2}{7}và\dfrac{4}{9}=\dfrac{2}{7}=\dfrac{2.9}{7.9}=\dfrac{18}{63};\dfrac{4}{9}=\dfrac{4.7}{9.7}=\dfrac{28}{63}\)
\(\dfrac{5}{8}và\dfrac{8}{5}=\dfrac{5}{8}=\dfrac{5.5}{8.5}=\dfrac{25}{40};\dfrac{8}{5}=\dfrac{8.5}{5.8}=\dfrac{40}{40}\)
\(\dfrac{11}{18}và\dfrac{5}{6}=\dfrac{11}{18};\dfrac{5}{6}=\dfrac{5.3}{6.3}=\dfrac{15}{18}\)
\(\dfrac{7}{8}và\dfrac{11}{12}=\dfrac{7}{8}=\dfrac{7.3}{8.3}=\dfrac{21}{24};\dfrac{11}{12}=\dfrac{11.2}{12.2}=\dfrac{22}{24}\)