1.
1)
а) -16/17-14/17-15/17-6/17 = -51/17 = -3,
б) 10/13+3/13-5/13-8/13 = 0,
в) -5/7-6/7+1/7+3/7 = -7/7 = -1,
г) 16/19-2/19-5/19+10/19 = 19/19 = 1,
2)
а) -1/2-7/10+3/5-11/20 = -10/20-14/20+12/20-11/20 = -23/20 = -1 3/20,
б) 17/30+5/6-3/10-8/15 = 17/30+25/30-9/30-16/30 = 17/30,
в) -7/15+4/9-28/45+2/3 = -21/45+20/45-28/45+30/45 = 1/45,
г) 1/2-49/50-3/5-9/10 = 25/50-49/50-30/50-45/50 = -99/50 = -1 49/50