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b)3/4+1/2=3/4+2/4=5/4
c)2 3/4-1/2=2 3/4-2/4=2 1/4
d)1 1/4-1/2=5/4-2/4=3/4
e)2 1/2-3/4=5/2-3/4=10/4-3/4=7/4=1 3/4
f)3 3/4+2 1/2=3 3/4+2 2/4=5 5/4=6 1/4
g)15 1/2+6 3/4=15 2/4+6 3/4=21 5/4=22 1/4
h)12 1/4-8 1/2=`12 1/4-8 2/4=11 5/4-8 2/4=3 3/4