Дроби помогите пожалусто
12 7/15-9 3/4+5 11/12=12 28/60-9 45/60 +5 55/60=11 88/60-9 45/60 +5 55/60=7 87/60=8 27/60 6 5/9+3-7/12=9 5/9-7/12=9 20/36-21/36=8 56/36-21/36=8 35/36 8 7/15-5 3/4+6=8 28/60-5 45/60+6= 7 88/60-5 45/60+6=2 37/60+6=8 37/60