1) -1,5-3 4/5-8 3/20;    2)-3 7/15-0,4-6 1/3;     3)-2 5/8-9,25-3/4

-1,5-3 4/5-8 3/20=-1,5-3,8-8,15=-13,45-3 7/15-0,4-6 1/3=-3 7/15-4/10-6 1/3=-3 14/30-12/30-6 10/30=-10 1/5=-10,5-2 5/8-9,25-3/4=-2 5/8-9 1/4-3/4=-2 5/8-9 2/8-6/8=-12 5/8