1).a). 2/5 + 4/5=8/5
1 + 5/6=6/6+5/6=11/6
1/2 + 3/4=2/4+3/4=5/4
5/3 - 1/5= 25/15- 3/15=22/15
5/18 - 1/12= 10/36 - 3/36=7/36
b).. 6/7 + 43/7= 49/7 = 7/1=7
25/6 - 2=25/6 - 12/6=13/6
5/3 - 1/15= 25/3 -1/15=24/15=8/3
3/2 + 9/7= 21/14 + 27/14= 48/14=24/7
7/20 - 1/12 = 21/60 - 5/60=16/60=8/30= 4/15
c). 21/2 -9/2=12/2=6/1=6
4- 2/5= 20/5 - 2/5 = 18/5
7/20 + 3/20=10/20=1/10
9/4 - 2/5 = 45/20 - 8/20 = 37/20
3/25 + 7/10= 6/50 + 35/50=41/50
