b)6/7-2/3=6•3/21-2•7/21=(18-14)/21=4/21
a)3/9+5/2=1/3+5/2=(2+15)/6=17/6
c)7/4-9/5=(7•5-9•4)/20=-1/20
d)3/8+1/7=21/56+8/56=29/56
e)-7/3-1/4=(-28-3)/12=-31/12
f)2/11-3/10=20/110-33/110=-13/110
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b)6/7-2/3=6•3/21-2•7/21=(18-14)/21=4/21
a)3/9+5/2=1/3+5/2=(2+15)/6=17/6
c)7/4-9/5=(7•5-9•4)/20=-1/20
d)3/8+1/7=21/56+8/56=29/56
e)-7/3-1/4=(-28-3)/12=-31/12
f)2/11-3/10=20/110-33/110=-13/110