2-1\2 4-4\5 7-4\7 10-9\11

Question

2-1\2 4-4\5 7-4\7 10-9\11

Answer 1

2-1\2=1 2\2-1\2=1 1\2
4-4\5=3 5\5-4\5=3 1\5
7-4\7=6 7\7-4\7=6 3\7
10-9\11=9 11\11-9\11=9 2\11

Answer 2

1 1\2
3 1\5
6 3\7
9 2\11