4. Сложите дроби.

4. Сложите дроби:

a) \( \frac{7}{12} + \frac{1}{4} = \frac{7}{12} + \frac{3}{12} = \frac{10}{12} \)

б) \( \frac{1}{5} + \frac{2}{15} = \frac{3}{15} + \frac{2}{15} = \frac{5}{15} \)

в) \( \frac{5}{12} + \frac{3}{20} = \frac{25}{60} + \frac{9}{60} = \frac{34}{60} \)

г) \( \frac{7}{24} + \frac{1}{60} = \frac{35}{120} + \frac{2}{120} = \frac{37}{120} \)

д) \( \frac{1}{42} + \frac{2}{63} = \frac{3}{126} + \frac{4}{126} = \frac{7}{126} \)

е) \( \frac{2}{9} + \frac{1}{12} = \frac{8}{36} + \frac{3}{36} = \frac{11}{36} \)

ж) \( \frac{1}{42} + \frac{2}{63} = \frac{3}{126} + \frac{4}{126} = \frac{7}{126} \)

3) \( \frac{5}{12} + \frac{3}{20} = \frac{25}{60} + \frac{9}{60} = \frac{34}{60} \)

Ответ:

a) \( \frac{10}{12} \)

б) \( \frac{5}{15} \)

в) \( \frac{34}{60} \)

г) \( \frac{37}{120} \)

д) \( \frac{7}{126} \)

е) \( \frac{11}{36} \)

ж) \( \frac{7}{126} \)

3) \( \frac{34}{60} \)