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b)3/11+1/2=6/22+11/22=17/22
c)4/5+3/4=16/20+15/20=31/20=1 11/20
d)11/12-2/5=55/60-24/60=31/60
e)8/9-3/4=32/36-27/36=5/36
f)5/9-1/2=10/18-9/18=1/18
2a)1/3+1/6=2/6+1/6=3/6=1/3
b)2/7+4/21=6/21+4/21=10/21
c)2/5+1/20=8/20+1/20=9/20
d)11/15-1/3=11/15-5/15=6/15
e)25/27-4/9=25/27-12/27=13/27
f)23/24-5/12=23/24-10/24=13/24
3a)4/15+7/10=8/30+21/30=29/30
b)9/12+5/16=36/48+15/48=51/48=1 1/16
c)3/4-3/10=15/20-6/20=9/20
d)21/24-5/36=63/72-10/72=53/72
a)3/7+2/5=15/35+14/35=29/35
b)3/11+1/2=6/22+11/22=17/22
c)4/5+3/4=16/20+15/20=31/20=1 11/20
d)11/12-2/5=55/60-24/60=31/60
e)8/9-3/4=32/36-27/36=5/36
f)5/9-1/2=10/18-9/18=1/18
2
a)1/3+1/6=2/6+1/6=3/6=1/3
b)2/7+4/21=6/21+4/21=10/21
c)2/5+1/20=8/20+1/20=9/20
d)11/15-1/3=11/15-5/15=6/15
e)25/27-4/9=25/27-12/27=13/27
f)23/24-5/12=23/24-10/24=13/24
3
a)4/15+7/10=8/30+21/30=29/30
b)9/12+5/16=36/48+15/48=51/48=1i3/48=1i1/16
c)3/4-3/10=15/20-6/20=9/20
d)21/24-5/36=63/72-10/72=53/72