Пошаговое объяснение:

5 + 2 3/8 = 7 3/8

4 1/9 + 3 8/9 = 7 9/9 = 8

5 2/3 + 2 2/3 = 7 4/3 = 8 1/3

1 - 17/20 = 20/20 - 17/20 = 3/20

10 - 3 3/8 = 9 8/8 - 3 3/8 = 6 5/8

6 2/9 - 3 6/9 = 5 11/9 - 3 6/9 = 2 5/9

(7 7/15 - 3 7/15) - (1 12/17 + 1 7/17) =

4 - 2 19/17 = 4 - 3 2/17 = 3 17/17 - 3 2/17 = 15/17

50 1/4 - 4 3/4 = 49 5/4 - 4 3/4 = 45 2/4 = 45 1/2 - масса товара (нетто)