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b)=6/12-4/12-3/12=-1/12
c)=1/2-(4/12-3/12)=1/2-1/12=6/12-1/12=5/12
d)=1/2-1/12=6/12-1/12=5/12
e)=(1/2*3/2)*4/3=3/4*4/3=1
f)=1/2÷(2/3*4/3)=1/2*8/9=4/9