1. Вычислите. 1) 2/5 + 1/5, 2) 1870 - 22/5, 3) 5 5/6 - 5 1/6

Решение:

• 1) \(\frac{2}{5} + \frac{1}{5} = \frac{2+1}{5} = \frac{3}{5}\)
• 2) \(1870 - \frac{22}{5} = 1870 - 4.4 = 1865.6\)
• 3) \(5 \frac{5}{6} - 5 \frac{1}{6} = \frac{5 \times 6 + 5}{6} - \frac{5 \times 6 + 1}{6} = \frac{35}{6} - \frac{31}{6} = \frac{35-31}{6} = \frac{4}{6} = \frac{2}{3}\)

Ответ: 1) \(\frac{3}{5}\), 2) 1865.6, 3) \(\frac{2}{3}\)