(4 1/2 - 0,7) * (1,85 + 3/20) = (4 1/2 - 7/10) * ( 1 85/100 + 3/20) = (4 5/10 - 7/10) * ( 1 17/20 + 3/20) = (3 15/10 - 7/10) * 1 20/20 = 3 8/10 * 2 = 3 4/5 * 2 = 19/5 * 2 = 38/5 = 7,6
(2,6 + 1 2/5) * (4 - 2 4/25) = (2 6/10 + 1 4/10) * (3 25/25 - 2 4/25) = 3 10/10 * 1 21/25 = 4 * 46/25 = 184/25 = 7,36
(7 2/5 + 6,4) : (5,2 - 2 9/10) = (7 2/5 + 6 4/10) : (52/10 - 29/10) = (7 4/10 + 6 4/10) : 23/10 = 13 8/10 : 23/10 = 138/10 * 10/23 = 138/23 = 6
(14 - 2 3/10) : (3/5 + 0,7) = (13 10/10 - 2 3/10) : (3/5 + 7/10) = 11 7/10 : (6/10 + 7/10) = 117/10 : 13/10 = 117/10 * 10/13 = 117/13 = 9