4+2/3;3/11+7/11;4/7+3/7;1-5/8;5 8/9-

4+2/3 = 4/1+2/3=12/3+2/3=14/3

3/11+7/11=10/11

4/7+3/7=7/7=1

1-5/8=1/1-5/8=8/8-5/8=3/8

5-8/9=5/1-8/9=45/9-8/9=37/9