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b)...= 3/2 - 1/3=9/6 - 2/6=7/6=1 1/6
c)...=8/9*1/2-9/10*1/3=4/9-3/10=
=40/90-27/90=13/90
d)...=1/6+4/5=5/30+24/30=29/30
e)...=3/5*1/2=3/10