Bài 2:
a: \(=\dfrac{-3}{7}+\dfrac{15}{26}-\dfrac{4}{26}+\dfrac{3}{7}=\dfrac{11}{26}\)
b: \(=\dfrac{17}{7}+\dfrac{2}{9}-\dfrac{10}{7}-15=-14+\dfrac{2}{9}=\dfrac{-124}{9}\)
c: \(=\dfrac{-11}{23}\left(\dfrac{6}{7}+\dfrac{8}{7}\right)-\dfrac{1}{23}=\dfrac{-22}{23}-\dfrac{1}{23}=-1\)
d: \(=\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right)\cdot\dfrac{4-3-1}{24}=0\)