Вопрос:

17. Выполните действие: a) 5/6 + 1/4; б) 7/8 - 5/6; в) 10 3/10 - 15 7/15; г) 5 5/8 - 3 5/9;\(\ne\)) 8/9 : 10/27.

Ответ:

17. Выполните действие:

  1. а) \( \frac{5}{6} + \frac{1}{4} = \frac{10}{12} + \frac{3}{12} = \frac{13}{12} = 1\frac{1}{12} \)
  2. б) \( \frac{7}{8} - \frac{5}{6} = \frac{21}{24} - \frac{20}{24} = \frac{1}{24} \)
  3. в) \( 10\frac{3}{10} - 15\frac{7}{15} = \frac{103}{10} - \frac{232}{15} = \frac{309}{30} - \frac{464}{30} = -\frac{155}{30} = -5\frac{5}{30} = -5\frac{1}{6} \)
  4. г) \( 5\frac{5}{8} - 3\frac{5}{9} = \frac{45}{8} - \frac{32}{9} = \frac{405}{72} - \frac{256}{72} = \frac{149}{72} = 2\frac{5}{72} \)
  5. д) \( \frac{8}{9} : \frac{10}{27} = \frac{8}{9} \times \frac{27}{10} = \frac{8 \times 27}{9 \times 10} = \frac{8 \times 3}{10} = \frac{24}{10} = \frac{12}{5} = 2\frac{2}{5} \)

Ответ: а) \(1\frac{1}{12}\); б) \(\frac{1}{24}\); в) \(-5\frac{1}{6}\); г) \(2\frac{5}{72}\); д) \(2\frac{2}{5}\).