\(\dfrac{15}{40}\) = \(\dfrac{3}{8}\) rút gọn cho 5

\(\dfrac{21}{39}\) = \(\dfrac{7}{13}\) rút gọn cho 3

\(\dfrac{16}{24}\) = \(\dfrac{4}{6}\) rút gọn cho 4

\(\dfrac{36}{72}\) = \(\dfrac{4}{8}\) rút gọn cho 9

\(\dfrac{24}{1000}\) = \(\dfrac{3}{125}\) rút gọn cho 8