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3/4-2/3=9/12-8/12=1/12
4/5-1/3=12/15-5/15=7/12
6/7-2/3=18/21-14/21=4/21
b)19/20-13/30=57/60-26/60=31/60
15/18-3/4=30/36-27/36=3/36=1/12
26/27-7/9=26/27-21/27=5/27
11/12-7/8=22/24-21/24=1/24
c)1-7/12=12/12-7/12=5/12
2-13/15=1 15/15-13/15=1 2/15
5-18/25=4 25/25-18/25=4 7/25
6-37/40=5 40/40-37/40=5 3/40
d)4 4/5-6/7=4 28/35-30/35=3 63/35-30/35=3 33/35
3 5/16-5/6=3 15/48-40/48=1 45/48-40/48=1 5/48
5 25/36-13/24=5 10/72-39/72=1 40/72- 39/72=1 1/72
8 11/18-22/27=8 33/54-44/54=7 66/54-44/54=7 22/54
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