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Пошаговое объяснение:

№1

1) 7/12 + 5/8 = 14/24 + 15/24 = 29/24 = 1 5/24

2) 2 13/15 + 1 1/5 = 2 13/15 + 1 3/15 = 3 16/15 = 4 1/15

№2

1) 7/10 - 3/8 = 28/40 - 15/40 = 13/40

2) 3 5/12 - 1 3/4 = 3 5/12 - 1 9/12 = 2 17/12 - 1 9/12 = 1 8/12 = 1 2/3