Пошаговое объяснение:
(12 : 3 3/5 + 2/3) * 2/3 = (12 : 18/5 + 2/3) * 2/3 = (10/3 + 2/3) * 2/3 = 4 * 2/3 = 8/3=
=2 2/3
(19/21 : 1 1/21) : (38/41 : 2/41) = (19/21 * 21/22) : (38/41 * 41/2) = 19/22 : 19 = 1/22.
Пошаговое объяснение:
(12 : 3 3/5 + 2/3) * 2/3 = (12 : 18/5 + 2/3) * 2/3 = (10/3 + 2/3) * 2/3 = 4 * 2/3 = 8/3=
=2 2/3
(19/21 : 1 1/21) : (38/41 : 2/41) = (19/21 * 21/22) : (38/41 * 41/2) = 19/22 : 19 = 1/22.