1)19 \(\dfrac{5}{8}\) : \(\dfrac{7}{12}\) - 15 \(\dfrac{1}{4}\) : \(\dfrac{7}{12}\)
2) \(\dfrac{2}{5}\) .\(\dfrac{1}{3}\) _ \(\dfrac{2}{15}\) : \(\dfrac{1}{5}\) +\(\dfrac{3}{5}\) .\(\dfrac{1}{3}\)
3) \(\dfrac{4}{9}\). \(19\dfrac{1}{3}\)-\(\dfrac{4}{9}\).\(39\dfrac{1}{3}\)
Giúp mình nha