Пошаговое объяснение:
1) 13/18 - 3/10 = 65/90 - 27/90 = 38/90 = 19/45
2) 4/5 - 3/8 + 1/4 = 32/40 - 15/40 + 10/40 = 27/40
3) 17/18 + 1/12 = 34/36 + 3/36 = 37/36= 1 1/36
Пошаговое объяснение:
1) 13/18 - 3/10 = 65/90 - 27/90 = 38/90 = 19/45
2) 4/5 - 3/8 + 1/4 = 32/40 - 15/40 + 10/40 = 27/40
3) 17/18 + 1/12 = 34/36 + 3/36 = 37/36= 1 1/36