Ответ:

1. Вычисление:

  1. а) \(1\frac{4}{9} + 2\frac{5}{18} = \frac{13}{9} + \frac{41}{18} = \frac{26}{18} + \frac{41}{18} = \frac{67}{18} = 3\frac{13}{18}\)
  2. б) \(3\frac{7}{36} - 1\frac{5}{24} = \frac{115}{36} - \frac{29}{24} = \frac{230}{72} - \frac{87}{72} = \frac{143}{72} = 1\frac{71}{72}\)
  3. в) \(2\frac{7}{30} + 3\frac{9}{20} - 4\frac{59}{60} = \frac{67}{30} + \frac{69}{20} - \frac{299}{60} = \frac{134}{60} + \frac{207}{60} - \frac{299}{60} = \frac{341-299}{60} = \frac{42}{60} = \frac{7}{10}\)

Ответ: а) \(3\frac{13}{18}\); б) \(1\frac{71}{72}\); в) \(\frac{7}{10}\).