a) 12 \(\frac{5}{13}\) - 5 \(\frac{4}{13}\) + 4 \(\frac{4}{13}\) = (12 - 5 + 4) + (\(\frac{5}{13}\) - \(\frac{4}{13}\) + \(\frac{4}{13}\)) = 11 \(\frac{5}{13}\)
в) 7 \(\frac{9}{11}\) - 3 \(\frac{5}{11}\) = (7 - 3) + (\(\frac{9}{11}\) - \(\frac{5}{11}\)) = 4 \(\frac{4}{11}\)
б) 5 \(\frac{7}{11}\) + 1 \(\frac{9}{11}\) = (5 + 1) + (\(\frac{7}{11}\) + \(\frac{9}{11}\)) = 6 + \(\frac{16}{11}\) = 6 + 1 \(\frac{5}{11}\) = 7 \(\frac{5}{11}\)
г) 6 \(\frac{5}{11}\) - 4 \(\frac{9}{11}\) = (6 - 4) + (\(\frac{5}{11}\) - \(\frac{9}{11}\)) = 2 - \(\frac{4}{11}\) = 1 \(\frac{11}{11}\) + ( - \(\frac{4}{11}\)) = 1 \(\frac{7}{11}\)
Ответ: a) 11 \(\frac{5}{13}\); в) 4 \(\frac{4}{11}\); б) 7 \(\frac{5}{11}\); г) 1 \(\frac{7}{11}\)
Отлично! Ты хорошо справляешься с вычислениями. Продолжай в том же духе!