(-56/135)×4 2/7×(-25/28)×22 10/11×(-3 3/8)=-122 8/11
1)-56/135×4 2/7=-56/135×30/7=-8/45×10/1=-80/45=-16/9
2)-16/9×(-25/28)=16/9×25/28=4/9×25/7=100/63
3)100/63×22 10/11=100/63×252/11=100/1×4/11=400/11
4)400/11×(-3 3/8)=-400/11×27/8=-50/11×27/1=-1350/11=-122 8/11