a: \(=\dfrac{-1}{2}\cdot\dfrac{3}{4}\cdot\dfrac{5}{8}\cdot\dfrac{8}{9}=-\dfrac{1}{2}\cdot\dfrac{3}{4}\cdot\dfrac{5}{9}=\dfrac{-15}{72}=\dfrac{-5}{24}\)
b: \(=-\dfrac{7}{8}\cdot\dfrac{4}{5}\cdot\dfrac{10}{7}=\dfrac{-40}{40}=-1\)
c: \(=\dfrac{6}{5}-\dfrac{1}{18}=\dfrac{108-5}{90}=\dfrac{103}{90}\)
d: \(=\dfrac{3}{8}-\dfrac{6}{8}+\dfrac{4}{8}=\dfrac{1}{8}\)
e: \(=\dfrac{-2}{3}+\dfrac{3}{4}+\dfrac{1}{6}-\dfrac{1}{2}\)
\(=\dfrac{-8}{12}+\dfrac{9}{12}+\dfrac{2}{12}-\dfrac{6}{12}=\dfrac{-3}{12}=\dfrac{-1}{4}\)
f: \(=\dfrac{3}{17}\left(\dfrac{13}{15}+\dfrac{2}{15}\right)=\dfrac{3}{17}\)
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