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b)
c)
d)
e)
f)
g)
h)
b)5/6-8/9=15/18-16/18=-1/18
c)1 1/6-7/9=7/6-7/9=21/18-14/18=7/18
d)3/5-1 2/3=9/15-5/3=9/15-25/15=-16/15=-1 1/15
e)2 2/9-1 5/12=20/9-17/12=240/108-153/108=87/108
f)1 1/7+2 2/3=1 3/21+2 14/31=3 17/21
g)3 2/5-5 2/3=3 6/15-5 10/15=-2 4/15
h)4 1/6-2 7/15=4 5/30-2 14/30=1 21/30