Sau khi thực hiện các phép tính: \(\left(7-\dfrac{2}{3}-\dfrac{1}{4}\right)-\left(\dfrac{4}{3}-\dfrac{10}{4}\right)-\left(\dfrac{5}{4}-\dfrac{1}{3}\right)\) , ta nhận được kết quả là
\(1\dfrac{1}{3}\). \(6\dfrac{2}{3}\). \(\dfrac{19}{3}\). \(10\dfrac{1}{3}\). Hướng dẫn giải:\(\left(7-\dfrac{2}{3}-\dfrac{1}{4}\right)-\left(\dfrac{4}{3}-\dfrac{10}{4}\right)-\left(\dfrac{5}{4}-\dfrac{1}{3}\right)\) \(=7-\dfrac{2}{3}-\dfrac{1}{4}-\dfrac{4}{3}+\dfrac{10}{4}-\dfrac{5}{4}+\dfrac{1}{3}\) \(=7+\left(-\dfrac{2}{3}-\dfrac{4}{3}+\dfrac{1}{3}\right)+\left(-\dfrac{1}{4}+\dfrac{10}{4}-\dfrac{5}{4}\right)\) \(=7-\dfrac{5}{3}+\dfrac{4}{4}\) \(=8-\dfrac{5}{3}=\dfrac{19}{3}\)
