Ответ:

Пошаговое объяснение:

1) x + 3/8 = 2 5/8

x = 2 5/8 - 3/8

x = 2 2/8

x = 2 1/4

2) x + 1 13/18 = 7 15/18

x = 7 15/18 - 1 13/18

x = 6 2/18

x = 6 1/9

3) x + 7/8 = 2 5/8

x = 2 5/8 - 7/8

x = 1 13/8 - 7/8

x = 1 6/8

x = 1 3/4