b: \(=\dfrac{-1}{4}+\dfrac{3}{10}\cdot\dfrac{15}{2}-\dfrac{2}{24}=\dfrac{-1}{4}+\dfrac{9}{4}-\dfrac{1}{12}=2-\dfrac{1}{12}=\dfrac{23}{12}\)
c: \(=-\dfrac{1}{8}+1-\dfrac{5}{2}+1=\dfrac{-1-20}{8}+2=\dfrac{-21}{8}+2=\dfrac{-5}{8}\)
d: \(=\dfrac{1}{4}:\dfrac{3}{4}+1-5=\dfrac{1}{3}-4=\dfrac{-11}{3}\)