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b)6*7-3/3=42-1=41
c)14-9/9+6*3=14-1+18=13-18=31
d)21*1/2+7/7=10,5+1=11,5
e)8/9-4:16-10/12=8/9-1/4-10/12=8/9-3/12-10/12=8/9-13/12=32/36-39/36=-7/36
f)(14*81-17/21):8/3=(1134-17/21):8/3=1133 4/21*3/8=23797/21 *3/8=71391/168=424 159/168