1) \(3\frac{4}{9} \div \frac{5}{11} = \frac{31}{9} \times \frac{11}{5} = \frac{341}{45} = 7\frac{26}{45}\)
2) \(\frac{1}{9} + 3.125 - 0.8 = \frac{1}{9} + \frac{3125}{1000} - \frac{8}{10} = \frac{1}{9} + \frac{25}{8} - \frac{4}{5} = \frac{40}{360} + \frac{11250}{360} - \frac{288}{360} = \frac{10992}{360} = \frac{916}{30} = 3\frac{46}{120} = 3\frac{23}{60} \approx 3.816\)
3) \((\frac{4}{5} - 4\frac{1}{3}) \div \frac{1}{29} = (\frac{4}{5} - \frac{13}{3}) \times 29 = (\frac{12}{15} - \frac{65}{15}) \times 29 = \frac{-53}{15} \times 29 = -\frac{1537}{15} = -102 \frac{7}{15} \)
4) \(23\frac{4}{5} \) это уже упрощённая дробь.