a: \(=\dfrac{8}{21}-\dfrac{5}{4}+\dfrac{3}{14}+\dfrac{13}{21}+\dfrac{1}{4}=1-1+\dfrac{3}{14}=\dfrac{3}{14}\)
b: \(=\dfrac{5}{8}\left(\dfrac{12}{5}-\dfrac{4}{3}\right)=\dfrac{5}{8}\cdot\dfrac{16}{15}=\dfrac{2}{3}\)
c: \(=\dfrac{6}{5}\left(\dfrac{4}{9}-\dfrac{3}{5}+\dfrac{5}{9}+\dfrac{1}{5}\right)=\dfrac{6}{5}\cdot\dfrac{3}{5}=\dfrac{18}{25}\)
d: \(=\dfrac{6}{7}:\left(\dfrac{3}{26}-\dfrac{3}{13}+\dfrac{1}{10}-\dfrac{8}{5}\right)=\dfrac{6}{7}:\dfrac{-21}{13}=\dfrac{-26}{49}\)
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