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7,15 - 1 1/5 = 7,15 - 1,2 = 5,95
3 2/3 * 12/10 = 11/2 * 12/10 = 44/10 = 4,4
5 1/4 : 1/8 = 21/4 * 8/1 = 168/4 = 42
(1 1/6 - 3 * 10/24) + 3 1/3 = (1 1/6 - 5/4) + 3 1/3 = ( 1 2/12 - 15/12) + 3 1/3 = - 1/12 + 3 1/3 = -1/12 + 3 4/12 = 3 3/12 = 3 1/4