1) 82/15-(85/12-(269/60-(11/5-11/6)))=328/60-(425/60-(269/60-(132/60-110/60)))=328/60-(425/60-(269/60-22/60))=328/60-(425/60-247/60)=328/60-178/60=150/60=5/2= 2 1/2
2)157/24-((343/24-511/48)-(11/4-19/12))- 17/16=314/48-((686/48-511/48)-(132/48-76/48)-51/48=263/48-(175/48-56/48)=263/48-119/48=144/48=3