Sau khi thực hiệncác phép tính: \(\left(\dfrac{1}{111}+\dfrac{1}{1111}+\dfrac{1}{11111}\right).\left(\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{5}{6}\right)\) , ta có kết quả là
\(0\). \(\dfrac{2}{111}\). \(2\). \(\dfrac{5}{111}\). Hướng dẫn giải:\(\left(\dfrac{1}{111}+\dfrac{1}{1111}+\dfrac{1}{11111}\right).\left(\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{5}{6}\right)\)
\(=\left(\dfrac{1}{111}+\dfrac{1}{1111}+\dfrac{1}{11111}\right).\left(\dfrac{3}{6}+\dfrac{2}{6}-\dfrac{5}{6}\right)\)
\(=\left(\dfrac{1}{111}+\dfrac{1}{1111}+\dfrac{1}{11111}\right).0\)
\(=0\)
