3/4+1/5=4/5 3/4-1/5=11/20 5/6+2/9=19/18 5/6-2/9=11/182/3+3/5=19/152/3-3/5=1/156/7+1/2=19/146/7-1/2=5/142/3+1/6=5/6 1/3+1/4=7/121/3-1/4...