а) 2 3/4 - 1 5/6 = 2 + 3/4 - 1 - 5/6 = 1 3/4 - 1 5/6 = (7+3)/4 - (6+5)/6 = 10/4 - 11/6 = 5/2 - 11/6 = 15/6 - 11/6 = 4/6 = 2/3
б) 4 2/5 + 3 5/6 = 4 + 2/5 + 3 + 5/6 = 7 + 2/5 + 5/6 = 7 + 12/30 + 25/30 = 7 + 37/30 = (210+37)/30 = 247/30 = 8 7/30
в) 7 5/12 - (1 5/8 + 2 1/24) = 7 + 5/12 - (1 + 5/8 + 2 + 1/24) = 7 + 5/12 - 3 - 5/8 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 4 1/6
а) 2 3/4 - 1 5/6 = 2 + 3/4 - 1 - 5/6 = 1 3/4 - 1 5/6 = (7+3)/4 - (6+5)/6 = 10/4 - 11/6 = 5/2 - 11/6 = 15/6 - 11/6 = 4/6 = 2/3
б) 4 2/5 + 3 5/6 = 4 + 2/5 + 3 + 5/6 = 7 + 2/5 + 5/6 = 7 + 12/30 + 25/30 = 7 + 37/30 = (210+37)/30 = 247/30 = 8 7/30
в) 7 5/12 - (1 5/8 + 2 1/24) = 7 + 5/12 - (1 + 5/8 + 2 + 1/24) = 7 + 5/12 - 3 - 5/8 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 7 + 5/12 - 3 - 15/24 - 1 - 1/24 = 4 1/6