3. Выполните действия: А) \(\frac{4}{8}\) + \(\frac{5}{9}\) = i Б) \(\frac{4}{7}\) - \(\frac{5}{9}\) = i В) \(\frac{19}{20}\) - \(\frac{3}{4}\) = i Г) 4 \(\frac{1}{6}\) + 1 \(\frac{5}{12}\) = i Д) 2 \(\frac{5}{8}\) + 1 \(\frac{3}{10}\) = i Е) 6 \(\frac{5}{12}\) - 4 \(\frac{4}{10}\) = i

А) \(\frac{4}{8}\) + \(\frac{5}{9}\). Общий знаменатель 72. \(\frac{4}{8}\) = \(\frac{36}{72}\); \(\frac{5}{9}\) = \(\frac{40}{72}\). \(\frac{36}{72}\) + \(\frac{40}{72}\) = \(\frac{76}{72}\) = \(\frac{19}{18}\) = 1 \(\frac{1}{18}\)
Б) \(\frac{4}{7}\) - \(\frac{5}{9}\). Общий знаменатель 63. \(\frac{4}{7}\) = \(\frac{36}{63}\); \(\frac{5}{9}\) = \(\frac{35}{63}\). \(\frac{36}{63}\) - \(\frac{35}{63}\) = \(\frac{1}{63}\)
В) \(\frac{19}{20}\) - \(\frac{3}{4}\). Общий знаменатель 20. \(\frac{3}{4}\) = \(\frac{15}{20}\). \(\frac{19}{20}\) - \(\frac{15}{20}\) = \(\frac{4}{20}\) = \(\frac{1}{5}\)
Г) 4 \(\frac{1}{6}\) + 1 \(\frac{5}{12}\). Общий знаменатель 12. 4 \(\frac{2}{12}\) + 1 \(\frac{5}{12}\) = 5 \(\frac{7}{12}\)
Д) 2 \(\frac{5}{8}\) + 1 \(\frac{3}{10}\). Общий знаменатель 40. 2 \(\frac{25}{40}\) + 1 \(\frac{12}{40}\) = 3 \(\frac{37}{40}\)
Е) 6 \(\frac{5}{12}\) - 4 \(\frac{4}{10}\). Общий знаменатель 60. 6 \(\frac{25}{60}\) - 4 \(\frac{24}{60}\) = 2 \(\frac{1}{60}\)