a)a)6 2/7=(6×7+2)/7=44/7
4 1/7=(4×7+1)/7=29/7
6 2/7-4 1/7=44/7-29/7=15/7
b) 12 1/9-5 4/9=109/9-49/9=60/9
c) 8 4/5-3 1/5=44/5-16/5=28/5
d)18 2/11-7 5/11=200/11-82/11=118/11
