Контрольные задания
Вопрос:Фото задания: Вычислите: 19/21 − 5/6; 34/45 − 7/10; 4/21 + 9/14; 4/9 + 17/63; 11/24 − 7/16.Фото задания

Ответ:

  1. \(\frac{19}{21}-\frac{5}{6}=\frac{38}{42}-\frac{35}{42}=\frac{3}{42}=\frac{1}{14}\).
  2. \(\frac{34}{45}-\frac{7}{10}=\frac{68}{90}-\frac{63}{90}=\frac{5}{90}=\frac{1}{18}\).
  3. \(\frac{4}{21}+\frac{9}{14}=\frac{8}{42}+\frac{27}{42}=\frac{35}{42}=\frac{5}{6}\).
  4. \(\frac{4}{9}+\frac{17}{63}=\frac{28}{63}+\frac{17}{63}=\frac{45}{63}=\frac{5}{7}\).
  5. \(\frac{11}{24}-\frac{7}{16}=\frac{22}{48}-\frac{21}{48}=\frac{1}{48}\).