Контрольные задания
Вопрос:Фото задания: 4. Сложи дроби: 1/10 + 7/30; 5/12 + 1/4; 1/5 + 2/15; 5/6 + 1/9; 2/9 + 5/12; 7/24 + 1/60; 1/42 + 2/63; 5/12 + 3/20.Фото задания

Ответ:

  1. \(\frac{1}{10}+\frac{7}{30}=\frac{3}{30}+\frac{7}{30}=\frac{10}{30}=\frac{1}{3}\).
  2. \(\frac{5}{12}+\frac{1}{4}=\frac{5}{12}+\frac{3}{12}=\frac{8}{12}=\frac{2}{3}\).
  3. \(\frac{1}{5}+\frac{2}{15}=\frac{3}{15}+\frac{2}{15}=\frac{5}{15}=\frac{1}{3}\).
  4. \(\frac{5}{6}+\frac{1}{9}=\frac{15}{18}+\frac{2}{18}=\frac{17}{18}\).
  5. \(\frac{2}{9}+\frac{5}{12}=\frac{8}{36}+\frac{15}{36}=\frac{23}{36}\).
  6. \(\frac{7}{24}+\frac{1}{60}=\frac{35}{120}+\frac{2}{120}=\frac{37}{120}\).
  7. \(\frac{1}{42}+\frac{2}{63}=\frac{3}{126}+\frac{4}{126}=\frac{7}{126}=\frac{1}{18}\).
  8. \(\frac{5}{12}+\frac{3}{20}=\frac{25}{60}+\frac{9}{60}=\frac{34}{60}=\frac{17}{30}\).