a: \(\dfrac{1}{3}=\dfrac{5}{15}\)
\(\dfrac{3}{2}=\dfrac{12}{8}\)
\(\dfrac{12}{16}=\dfrac{3}{4}\)
\(\dfrac{15}{20}=\dfrac{3}{4}\)
b: \(\dfrac{7}{14}=\dfrac{1}{2}\)
\(\dfrac{4}{9}=\dfrac{12}{27}\)
\(\dfrac{10}{15}=\dfrac{2}{3};\dfrac{2}{5}=\dfrac{18}{45}\)