2/3+8/9=1 5/9-1/9=1 4/9+5/6=2 5/18
2 5/18.
Пошаговое объяснение:
2/3 + 8/9 - 1/9 + 5/6 =
= 12/18 + 16/18 - 2/18 + 15/18 = 41/18 =
= 2 5/18.
Или так:
2/3 + 8/9 - 1/9 + 5/6 = (2/3 + 5/6) + (8/9 - 1/9) = (4/6 + 5/6) + 7/9 = 9/6 + 7/9 =
= 3/2 + 7/9 = 1 1/2 + 7/9 = 1 9/18 + 14/18 = 1 23/18 = 2 5/18.
