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b) 1 5/6-3 1/3=11/6-10/3=11/6-20/6=-9/6=-1,5
c) 4,3-7,5=43/10-75/10=-32/10=-3,2
d) 5-(-12)-7+14=5+12-7+14=24
e) 1,6-2 1/6-1=16/10-13/6-1=48/30-65/30-30/30=-47/30=-1 17/30