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12 5/12+4 1/8-4 2/3=

5 целых 9/10 + (5-2 целых 8/15) =

1) = 95/8=11 7/8 = 11.875 2) = 5 9/10+2 7/15=8 11/30

12 5/12 + 4 1/8 - 4 2/3 = (12 + 4 - 4) + (10/24 + 3/24 - 16/24) = 12 + (- 3/24) = 11 + (24/24 - 3/24) = 11 + 21/24 = 11 21/24 = 11 7/8

5 9/10 + (5 - 2 8/15) = 5 9/10 + (4 15/15 - 2 8/15) = 5 9/10 + 2 7/15 = (5 + 2) + (27/30 + 14/30) = 7 + 41/30 = 8 11/30