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b) -1 1/2 + [-3 1/4] + 5,5 + 7,25 =-1 1/2-3 1/4+5,5+7,25=-1,5 -3,75+5,5+7,25=4+4=8
c) 4,7+[-8 1/2] - (-3,5) - 2 3/4 = 4,7-8,5+3,5-2,75=-3,05
d) 5 1/3 + [-2 2/9] - 1 1/3 + [-4 1/9] =5 3/9-2 2/9-1 3/9 -4 1/9=21/9=7/3=2 1/3