1 7/9+28+2 5/12+5 2/9+7/12+4 3/4

17/9+28+2=2 ( ост. 5 ) 1) 28+9=37 2) 37+2=39 3) 39:17=2 ( ост. 5 ) 5/12+5=3 ( ост. 2 ) 1) 12+5=17 2) 17/5= 3 ( ост. 2 ) 2/9+7/12+4= 15 1) 9+7=14 2) 12+4=16 3) 16+14=30 4) 30/2=15