4 целых 3/8+3 целых 7/8 - 1целая 3/7
4 3/8 +3 7/8 -1 3/7 = 35/8 + 31/8 - 10/7 = 245/56 + 217/56 - 80/56 = 382/56 = 6 46/56 = = 6 23/28