2
Пошаговое объяснение:
1) 3/9 + 1/3 = 3/9 + 3/9 = 6/9 = 2/3
2) 2/9 - 1/3 = 2/9 - 3/9 = -1/3
3) 2/3 : (-1/3) = 2/3 * (-3/1) = -6/3 = -2
4) -2 + 4 = 2
2
Пошаговое объяснение:
1) 3/9 + 1/3 = 3/9 + 3/9 = 6/9 = 2/3
2) 2/9 - 1/3 = 2/9 - 3/9 = -1/3
3) 2/3 : (-1/3) = 2/3 * (-3/1) = -6/3 = -2
4) -2 + 4 = 2