3/8+7/8=10/8=1 2/8
5/18+11/12= 10/36+33/36=43/36=1 7/36
2/11-5/11=11/11-5/11=6/11
8/9-5/9=3/9
3/5+2/5=5/5=1
8/17+1/17=9/17
1/4+1/6=3/12+2/12=5/12
5/8+1/8=6/8=3/4
7/9-1/9=6/9=2/3
2/14+3/21=1/7+1/7=2/7
3/8+7/8=10/8=1 2/8
5/18+11/12= 10/36+33/36=43/36=1 7/36
2/11-5/11=11/11-5/11=6/11
8/9-5/9=3/9
3/5+2/5=5/5=1
8/17+1/17=9/17
1/4+1/6=3/12+2/12=5/12
5/8+1/8=6/8=3/4
7/9-1/9=6/9=2/3
2/14+3/21=1/7+1/7=2/7