Контрольные задания
Вопрос:Фото задания: Вычислите: 1) 3/4 + 4/7; 2) 13/24 − 3/8; 3) 11/12 − 5/18; 4) 13/36 + 7/24; 5) 8/15 − 4/9; 6) 5/6 − 2/3 + 2/9.Фото задания

Ответ:

  1. \(\frac{3}{4}+\frac{4}{7}=\frac{21}{28}+\frac{16}{28}=\frac{37}{28}=1\frac{9}{28}\).
  2. \(\frac{13}{24}-\frac{3}{8}=\frac{13}{24}-\frac{9}{24}=\frac{4}{24}=\frac{1}{6}\).
  3. \(\frac{11}{12}-\frac{5}{18}=\frac{33}{36}-\frac{10}{36}=\frac{23}{36}\).
  4. \(\frac{13}{36}+\frac{7}{24}=\frac{26}{72}+\frac{21}{72}=\frac{47}{72}\).
  5. \(\frac{8}{15}-\frac{4}{9}=\frac{24}{45}-\frac{20}{45}=\frac{4}{45}\).
  6. \(\frac{5}{6}-\frac{2}{3}+\frac{2}{9}=\frac{15}{18}-\frac{12}{18}+\frac{4}{18}=\frac{7}{18}\).