61. \((\frac{5}{12} + \frac{3}{8}) \times \frac{6}{19}\)

Решение:

\((\frac{5}{12} + \frac{3}{8}) \times \frac{6}{19} = (\frac{5 \times 2}{12 \times 2} + \frac{3 \times 3}{8 \times 3}) \times \frac{6}{19} = (\frac{10}{24} + \frac{9}{24}) \times \frac{6}{19} = \frac{19}{24} \times \frac{6}{19} = \frac{19 \times 6}{24 \times 19} = \frac{6}{24} = \frac{1}{4}\)

Ответ: \(\frac{1}{4}\)