выполните действие
2/9+5/8
17/20-5/12
11/15-3/10+1/45

2/9+5/8=16/72+45/72=61/7217/20-5/12=51/60-25/60=26/6011/15-3/10+1/45=66/90-27/90+2/90=39/90+2/90=41/90