Элементарно)
1)82/15-(85/12-(269/60-(11/5-11/6)=82/15-(85/12-(269/60-(66/30-55/30)=82/15-(85/12-(269/60-11/30)=82/15-(85/12-(269/60-22/60)=82/15-(85/12-247/60)=82/15-(425/60-247/60)=82/15-178/60=328/60-178/60=150/60=2.5
2)157/24-((343/24-511/48)-(11/4-19/12))-17/16=157-((686/48-511/48)-(33/12-19/12))-17/16=157/24(175/48-14/12)-17/16=157-(175/48-56/48)-17/16=157/24-119/48-17/16=314/48-119/48-17/16=195/48-17/16=195/48-51/48=144/48=3