Вычисли устно и запиши ответ: 2 + 7/8 = ? 2 - 7/8 = ? 4 5/7 + 2 1/7 = ? 4 5/7 - 2 1/7 = ? 2 1/6 + 1 5/6 = ? 2 1/6 - 1 5/6 = ?

Решим примеры: 1) \(2 + \frac{7}{8} = \frac{2 \cdot 8}{8} + \frac{7}{8} = \frac{16}{8} + \frac{7}{8} = \frac{16+7}{8} = \frac{23}{8}\) Ответ: \(\frac{23}{8}\) 2) \(2 - \frac{7}{8} = \frac{2 \cdot 8}{8} - \frac{7}{8} = \frac{16}{8} - \frac{7}{8} = \frac{16-7}{8} = \frac{9}{8}\) Ответ: \(\frac{9}{8}\) 3) \(4 \frac{5}{7} + 2 \frac{1}{7} = (4 + 2) + (\frac{5}{7} + \frac{1}{7}) = 6 + \frac{5+1}{7} = 6 + \frac{6}{7} = 6 \frac{6}{7}\) Ответ: \(6 \frac{6}{7}\) 4) \(4 \frac{5}{7} - 2 \frac{1}{7} = (4 - 2) + (\frac{5}{7} - \frac{1}{7}) = 2 + \frac{5-1}{7} = 2 + \frac{4}{7} = 2 \frac{4}{7}\) Ответ: \(2 \frac{4}{7}\) 5) \(2 \frac{1}{6} + 1 \frac{5}{6} = (2 + 1) + (\frac{1}{6} + \frac{5}{6}) = 3 + \frac{1+5}{6} = 3 + \frac{6}{6} = 3 + 1 = 4\) Ответ: 4 6) \(2 \frac{1}{6} - 1 \frac{5}{6} = \frac{2 \cdot 6 + 1}{6} - \frac{1 \cdot 6 + 5}{6} = \frac{13}{6} - \frac{11}{6} = \frac{13 - 11}{6} = \frac{2}{6} = \frac{1}{3}\) Ответ: \(\frac{1}{3}\)