Помогите решить пожалуйста

1) 1 1/4 + 1 3/4 = 2 4/4 = 3
2) 4 1/5 - 3 3/5 = 3 6/5 - 3 3/5 = 3/5
3) 3 2/3 - 2 1/3 = 1 1/3
4) 5 1/2 + 1 1/2 = 6 2/2 = 7
5) 2 5/6 - 2 1/6 = 4/6 = 2/3
6) 2 5/9 + 2 4/9 = 4 9/9 = 5
7) 4 2/7 - 2 5/7 = 3 9/7 - 2 5/7 = 1 4/7
8) 1 2/8 + 3 3/8 = 4 5/8
9) 2 3/6 + 2 5/6 = 4 8/6 = 5 2/6 = 5 1/3
10) 3 4/9 - 1 2/9 = 2 2/9
11) 2 2/3 + 4 2/3 = 6 4/3 = 7 1/3
12) 2 3/10 + 1 7/10 = 3 10/10 = 4
13) 4 9/10 - 2 1/10 = 2 8/10 = 2 4/5
14) 4 3/8 - 3 1/8 = 1 2/8 = 1 1/4
15) 2 5/11 + 3 6/11 = 5 11/11 = 6
16) 1 7/12 + 2 5/12 = 3 12/12 = 4
17) 3 3/11 - 2 5/11 = 2 14/11 - 2 5/11 = 9/11
18) 2 4/15 - 1 7/15 = 1 19/15 - 1 7/15 = 12/15 = 4/5
19) 5 1/3 + 4 1/3 = 9 2/3
20) 2 7/20 - 1 3/20 = 1 4/20 = 1 1/5