Вариант 2: 1. \(\frac{6}{35} + \frac{3}{10}\) 2. \(\frac{8}{15} - \frac{4}{9}\) 3. \(\frac{4}{15} + \frac{7}{12}\) 4. \(\frac{11}{48} - \frac{5}{36}\) 5. \(\frac{4}{5} - \frac{2}{3} + \frac{4}{15}\)

Решение:

• 1. \(\frac{6}{35} + \frac{3}{10} = \frac{12}{70} + \frac{21}{70} = \frac{33}{70}\)
• 2. \(\frac{8}{15} - \frac{4}{9} = \frac{24}{45} - \frac{20}{45} = \frac{4}{45}\)
• 3. \(\frac{4}{15} + \frac{7}{12} = \frac{16}{60} + \frac{35}{60} = \frac{51}{60} = \frac{17}{20}\)
• 4. \(\frac{11}{48} - \frac{5}{36} = \frac{33}{144} - \frac{20}{144} = \frac{13}{144}\)
• 5. \(\frac{4}{5} - \frac{2}{3} + \frac{4}{15} = \frac{12}{15} - \frac{10}{15} + \frac{4}{15} = \frac{6}{15} = \frac{2}{5}\)

Ответ: 1. \(\frac{33}{70}\), 2. \(\frac{4}{45}\), 3. \(\frac{17}{20}\), 4. \(\frac{13}{144}\), 5. \(\frac{2}{5}\)