ВЫЧИСЛИТЕ ДРОБИ :
1 - 12/19;
8 - 3 6/15;
12 -11 6/11

1 - 12/19 = 19/19 - 12/19 = 7/198 - 3 6/15 = 7 15/15 - 3 6/15 = 4 9/15 = 4 3/512 -11 6/11 = 11 11/11 - 11 6/11 = 5/11