a: \(=\left(\dfrac{1}{2}+\dfrac{1}{3}\right):\left(\dfrac{1}{2}-\dfrac{1}{3}\right)+\dfrac{1}{2}\cdot2^3=\dfrac{5}{6}:\dfrac{1}{6}+4=5+4=9\)b: \(=-3-1+\dfrac{1}{4}:2=-4+\dfrac{1}{8}=\dfrac{-31}{8}\)Câu trả lời: a: \(=\left(\dfrac{1}{2}+\dfrac{1}{3}\right):\left(\dfrac{1}{2}-\dfrac{1}{3}\right)+\dfrac{1}{2}\cdot2^3=\dfrac{5}{6}:\dfrac{1}{6}+4=5+4=9\)b: \(=-3-1+\dfrac{1}{4}:2=-4+\dfrac{1}{8}=\dfrac{-31}{8}\)