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