Помогите решить дроби:
11/15-6/10 43/66+1/42
1/3-2/7 52/56+13/104
45/52-3/28 16/33+13/33
15/21-21/91 10/21+20/77
15/24-2/88 42/4+42/10
11\13-1/5 62/99+81/99
7/25-13/65 2/5+1/2
39/78-36/78 12/14+7/10
20/21-6/21 62/104+15/16
17/33-1/15 14/8+43/12
21/22-19/22 4/14+24/26
26/28-1/44 5/14+1/4
8/12-4/8 35/104+54/104
68/77-31/49 52/63+27/45
31/35-23/55 45/8+21/28
15/28-7/52 3/6+3/6
52/66-9/12 40/88+21/24
25/27-17/45 8/10+7/15
6/12-3/20 44/52+7/20
11/15-11/35 14/6+52/14
39/42-9/42 13/20+11/12
4/9-2/6 6/14+26/49
68/104-19/40 5/15+27/33
19/22-8/14 6/44+39/52
29/35-15/21 11/3+21/3
37/39-19/21 2/15+4/9
19/25-20/35