1 5/7
Пошаговое объяснение:
x : 12 + 3 2/3 = 3 17/21
x : 12 = 3 17/21 - 3 2/3
x : 12 = 3 17/21 - 3 14/21
x : 12 = 3/21 = 1/7
x = 1/7 * 12
x = 12/7
x = 1 5/7
1 5/7
Пошаговое объяснение:
x : 12 + 3 2/3 = 3 17/21
x : 12 = 3 17/21 - 3 2/3
x : 12 = 3 17/21 - 3 14/21
x : 12 = 3/21 = 1/7
x = 1/7 * 12
x = 12/7
x = 1 5/7