13- 5 целых7/12-1целая 4/15

13-67/12-19/15=(2340-1005-228)/(12*15)=1107/180

              7             4                                 7 |5      4|2                             7*5 - 4*2 13-5 ------ - 1 --------- = (13-5-1)+(-------- - -------) = (13-5-1)+(------------------) =            12            15                              12        15                                      60                             35-8                    27 = (13-5-1)+(-------------) = 7 -------------                             60                     60