Контрольные задания
Вопрос:Фото задания: Вычислите дроби в среднем столбце: 17/33 − 5/22; 27/76 − 0; 9/20 + 5/8; 2/7 + 13/28; 5/13 − 14/39; 5/8 − 2/7; 3/4 + 5/12;…Фото задания

Ответ:

  1. \(\frac{17}{33}-\frac{5}{22}=\frac{34}{66}-\frac{15}{66}=\frac{19}{66}\).
  2. \(\frac{27}{76}-0=\frac{27}{76}\).
  3. \(\frac{9}{20}+\frac{5}{8}=\frac{18}{40}+\frac{25}{40}=\frac{43}{40}=1\frac{3}{40}\).
  4. \(\frac{2}{7}+\frac{13}{28}=\frac{8}{28}+\frac{13}{28}=\frac{3}{4}\).
  5. \(\frac{5}{13}-\frac{14}{39}=\frac{15}{39}-\frac{14}{39}=\frac{1}{39}\).
  6. \(\frac{5}{8}-\frac{2}{7}=\frac{35}{56}-\frac{16}{56}=\frac{19}{56}\).
  7. \(\frac{3}{4}+\frac{5}{12}=\frac{9}{12}+\frac{5}{12}=\frac{7}{6}=1\frac{1}{6}\).
  8. \(\frac{15}{23}-\frac{27}{46}=\frac{30}{46}-\frac{27}{46}=\frac{3}{46}\).
  9. \(\frac{9}{25}-\frac{14}{117}=\frac{1053}{2925}-\frac{350}{2925}=\frac{703}{2925}\).
  10. \(\frac{17}{35}-\frac{13}{28}=\frac{68}{140}-\frac{65}{140}=\frac{3}{140}\).
  11. \(1-\frac{2}{7}=\frac{5}{7}\).
  12. \(\frac{13}{40}-\frac{11}{60}=\frac{39}{120}-\frac{22}{120}=\frac{17}{120}\).
  13. \(\frac{5}{12}+\frac{3}{4}=\frac{5}{12}+\frac{9}{12}=\frac{7}{6}=1\frac{1}{6}\).