1. Выполните действия: a) 5/16 * 12/25, b) 1 1/3 * 1/8, c) 3 3/5 * 11/24, d) 6 * 4 5/12.

Решение: a) 5/16 * 12/25 = (5 * 12) / (16 * 25) = 60/400 = 3/20. b) 1 1/3 * 1/8 = (4/3) * (1/8) = 4/(3 * 8) = 4/24 = 1/6. c) 3 3/5 * 11/24 = (18/5) * (11/24) = (18 * 11) / (5 * 24) = 198/120 = 33/20 = 1 13/20. d) 6 * 4 5/12 = 6 * (53/12) = (6 * 53)/12 = 318/12 = 26 1/2.