a: \(=\dfrac{2}{7}\cdot\dfrac{-3}{4}\cdot\dfrac{4}{7}=\dfrac{-6}{49}\)
b: \(=\dfrac{3}{5}:\dfrac{1}{15}=\dfrac{3}{5}\cdot15=9\)
c: \(=\dfrac{41}{7}-3-\dfrac{1}{2}=\dfrac{33}{14}\)
d: \(=-\dfrac{25}{12}-\dfrac{23}{12}-\dfrac{3}{2}=-4-\dfrac{3}{2}=-\dfrac{11}{2}\)