4) \(1\frac{1}{4}\) : \(\frac{2}{5}\) = \(\frac{25}{8}\) \(3\frac{1}{2}\) : \(\frac{4}{3}\) = \(\frac{21}{8}\) \(12\frac{1}{3}\) : \(\frac{3}{5}\) = \(\frac{190}{9}\)

Решение:

Примеры на деление смешанных чисел и дробей:

1. \(1\frac{1}{4} : \frac{2}{5} = \frac{5}{4} : \frac{2}{5} = \frac{5}{4} \times \frac{5}{2} = \frac{25}{8}\)
2. \(3\frac{1}{2} : \frac{4}{3} = \frac{7}{2} : \frac{4}{3} = \frac{7}{2} \times \frac{3}{4} = \frac{21}{8}\)
3. \(12\frac{1}{3} : \frac{3}{5} = \frac{37}{3} : \frac{3}{5} = \frac{37}{3} \times \frac{5}{3} = \frac{185}{9}\)

Ответ: \(\frac{25}{8}\), \(\frac{21}{8}\), \(\frac{185}{9}\).