2) 12/12-11/5=60/60-165/60=-165/60-60/60=105/60=1 45/60
4 7/12-3 5/12=1 2/12
1 45/60×1 2/12=105×12/60×14=105/70= 1 35/70
2) 12/12-11/5=60/60-165/60=-165/60-60/60=105/60=1 45/60
4 7/12-3 5/12=1 2/12
1 45/60×1 2/12=105×12/60×14=105/70= 1 35/70