А)3 целых 4/7-2целых 3/5 = б) 6 целых 5/6+2целых 3/8= в) 4целых 5/14+(5целых1/12-3целых 4/21)= Помог?

А) 3 4/7 - 2 3/5 = 3 20/35 - 2 21/35 = 2 55/35 - 2 21/25 = 34/25 = 1 9/25 б) 6 5/6 + 2 3/8 = 6 20/24 + 2 9/24 = 8 29/24 = 9 5/24 в) 4 5/14 + (5 1/12 - 3 4/21) = 4 5/14 + (5 7/84 - 3 16/84) = 4 5/14 + (4 71/84 - 3 16/84) = 4 5/14 + 1 55/84 = 4 30/84 + 1 55/84 = 5 85/84 = 6 1/84