Дам 20 балов -1 2/3+1/3. -5/7+1. 8 1/7+(-3). -1/4+(-1/2). -3 5/5+ 2 2/3
-1 1/3 2/7 36/7 = 5 1/7 -3/4 -20/15 = -1 1/3