(31/3=10.3 57/9= 6.3 10.3+6.3=16.6 21/4=5.25 5.25*16.6=87.15) (35/6=5.83 7/2= 3.5 97/8=12.125 5.83-3.5+12.125=14.455 11/15=0.73 0.73*14.455=10.6003) 87.15-10.6003=76.5496 16/39=0.41 0.41*76.5496=31.40 Ответ: 31,40