2) Решите примеры. Выполните необходимые преобразования в ответах. 3 2 — + — 5 5 8 5 — - — 9 9 4 5 — + — 7 7 13 8 — - — 15 15 7 9 — + — 10 10 5 7 — + — 8 8 7 7 — + — 12 12 16 12 — + — 21 21

Ответ: \(\frac{5}{5}\); \(\frac{3}{9}\); \(\frac{9}{7}\); \(\frac{5}{15}\); \(\frac{16}{10}\); \(\frac{12}{8}\); \(\frac{14}{12}\); \(\frac{28}{21}\)

Рассмотрим каждый пример по отдельности:

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

2) \(\frac{8}{9} - \frac{5}{9} = \frac{8-5}{9} = \frac{3}{9}\)

3) \(\frac{4}{7} + \frac{5}{7} = \frac{4+5}{7} = \frac{9}{7}\)

4) \(\frac{13}{15} - \frac{8}{15} = \frac{13-8}{15} = \frac{5}{15}\)

5) \(\frac{7}{10} + \frac{9}{10} = \frac{7+9}{10} = \frac{16}{10}\)

6) \(\frac{5}{8} + \frac{7}{8} = \frac{5+7}{8} = \frac{12}{8}\)

7) \(\frac{7}{12} + \frac{7}{12} = \frac{7+7}{12} = \frac{14}{12}\)

8) \(\frac{16}{21} + \frac{12}{21} = \frac{16+12}{21} = \frac{28}{21}\)

Ответ: \(\frac{5}{5}\); \(\frac{3}{9}\); \(\frac{9}{7}\); \(\frac{5}{15}\); \(\frac{16}{10}\); \(\frac{12}{8}\); \(\frac{14}{12}\); \(\frac{28}{21}\)

Ответ: \(\frac{5}{5}\); \(\frac{3}{9}\); \(\frac{9}{7}\); \(\frac{5}{15}\); \(\frac{16}{10}\); \(\frac{12}{8}\); \(\frac{14}{12}\); \(\frac{28}{21}\)