А) 4/15 + у/15 = 1 б) 8/15 - у/15 = 0 в) 19/15-у/15 = 1 г) 1-у/15 = 11/15
(4+у)/15 = 1 (8-у)/15 = 0 (19-у)/15 = 1 15-у = 11
4+у = 15 8-у = 0 19-у = 15 -у = 11-15
у = 15-4 -у = -8 -у = 15-19 у = 4
у = 11 у = 8 у = 4 1-4/15 = 11/15
4/15+11/15=1 8/15-8/15 = 0 19/15-4/15 = 1 15/15 - 4/15 = 11/15
15/15 = 1 0 = 0 15/15 = 1 11/15 = 11/15