- 3/4 -(-5/6)= - 3/4+5/6=5/6 - 3/4=10/12 - 9/12=1/12
25 - 32= - (32-25)= - 7
3 5/6 - 4 3/8= - (4 3/8 - 3 5/6)= - (4 9/24 - 3 20/24)= - (3 33/24 - 3 20/24)= - 13/24
- 3 - 4/9= - (3+4/9)= - 3 4/9
-5.5 - 2.8= - (5.5+2.8)= - 8.3
-7 8/9 - ( -9 1/6)= - 7 8/9+9 1/6=9 1/6 - 7 8/9=9 3/18 - 7 16/18=8 17/18 - 7 16/18=1 1/18