(5целых 3\7:1целая 1\14-2целых 5\9)*1,8-3целых 4\7:1целая  3\7

   (5 3/7 : 1 1/14 - 2 5/9) * 1,8 - 3 4/7 : 1 3/7 =  = (38/7 * 14/15 - 23/9) * 1,8 - 25/7 * 7/10 = = 76/15 * 18/10 - 23/9 * 18/10 - 25/10 = = 684/75 - 46/10 - 25/10 = = 9,12 - 4,6 - 2,5 = 2,02 1. 5 3/7 : 1 1/14 = 38/7 * 14/15 = 76/15 2. 76/15 * 1,8 = 76/15 * 18/10 = 684/75 = 9,12 3. 2 5/9 * 1,8 = 23/9 * 18/10 = 46/10 = 4,6 4. 3 4/7 : 1 3/7 = 25/7 * 7/10 = 25/10 = 2,5 5. 9,12 - 4,6 - 2,5 = 2,02