\(a,\dfrac{3}{2};\dfrac{4}{2};\dfrac{9}{10}\)
\(\dfrac{3}{2}=\dfrac{15}{10};\dfrac{4}{2}=\dfrac{20}{10};\dfrac{9}{10}\)
\(\Rightarrow\dfrac{9}{10}>\dfrac{4}{2}>\dfrac{3}{2}\)
\(b,\dfrac{49}{50};\dfrac{5}{5};\dfrac{7}{6}\)
\(\dfrac{7}{6}>\dfrac{5}{5}>\dfrac{49}{50}\)