a: \(=\dfrac{38}{24}-\dfrac{21}{24}+\dfrac{6}{24}=\dfrac{23}{24}\)
b: \(=\dfrac{5}{20}+\dfrac{8}{20}+\dfrac{10}{20}=\dfrac{23}{20}\)
c: \(=\dfrac{12}{20}+\dfrac{10}{20}+\dfrac{5}{20}=\dfrac{27}{20}\)
d: \(=\dfrac{6}{6}-\dfrac{2}{6}+\dfrac{5}{6}=\dfrac{9}{6}=\dfrac{3}{2}\)