1.107 Найдите значение выражения:

a) 3 8/13 - 5/13 + (1 5/39 - 1/13) = 3 3/13 + (44/39 - 3/39) = 3 3/13 + 41/39 = 3 9/39 + 41/39 = 3 50/39 = 4 11/39.
б) (1 2/3 - 1/6)² * 2 1/3 : 5/6 = (10/6 - 1/6)² * 7/3 : 5/6 = (9/6)² * 7/3 * 6/5 = (3/2)² * 14/5 = 9/4 * 14/5 = 63/10 = 6.3.