a: \(\dfrac{2}{6}=\dfrac{2:2}{6:2}=\dfrac{1}{3}\)
\(\dfrac{3}{6}=\dfrac{3:3}{6:3}=\dfrac{1}{2}\)
\(\dfrac{5}{10}=\dfrac{5:5}{10:5}=\dfrac{1}{2}\)
\(\dfrac{7}{14}=\dfrac{7:7}{14:7}=\dfrac{1}{2}\)
b: \(\dfrac{4}{12}=\dfrac{4:4}{12:4}=\dfrac{1}{3}\)
\(\dfrac{9}{36}=\dfrac{9:9}{36:9}=\dfrac{1}{4}\)
\(\dfrac{16}{24}=\dfrac{16:8}{24:8}=\dfrac{2}{3}\)
\(\dfrac{15}{30}=\dfrac{15:15}{30:15}=\dfrac{1}{2}\)