8,9+(-15) 1/3+1/2 1 5/9+(-3) 7,6×(-0,5)

8.9+(-15)×1/3+1/2×15/9+(-3)×7.6×(-0.5)=
8.9-15×1/3+1/2×15/9-3×7.6×(-0.5)=
=8.9-1/5+1/2×15/9-3×7.6×(-0.5)=
=8.9-0.2+15/18-22.8×(-0.5)=8.7+5/6+11.4=
=20.1+5/6=201/10+5/6=1206/60+50/60=
=1256/60=20 целых 56 шестидесятых.