1 7/9+3 4/9
4 5/13+1 9/13
9-3 11/13
7 4/9-2 5/9
6 2/9-4/9

1) 1.7/9+3.4/9=4.11/9=5.2/112)4.5/13+1.9/13=5.14/13=6.1/133)9-3.11/13=8.13/13-3.11/13=5.2/134)7.4/9-2.5/9=6.13/9-2.5/9=4.8/95)6.2/9-4/9=5.11/9-4/9=5.7/9