Пошаговое объяснение:
8/15 + 3/5 = 8/15 + 9/15 = 17/15 = 1 2/15
9/25 - 1/4 = 36/100 - 25/100 = 11/100
2/15 + 2/9 = 6/45 + 10/45 = 16/45
5/8 - 6/20 = 25/40 - 12/40 = 13/40
Пошаговое объяснение:
8/15 + 3/5 = 8/15 + 9/15 = 17/15 = 1 2/15
9/25 - 1/4 = 36/100 - 25/100 = 11/100
2/15 + 2/9 = 6/45 + 10/45 = 16/45
5/8 - 6/20 = 25/40 - 12/40 = 13/40