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b)6½ (-3,25)+(-1¾)+1 = -2,25+4,75=2,5
c)28-39+(-14)-(-12)-81=28-39-14+12-81=-94
d)16⅘ + (-4,8)+3⅕ +(-4⅕)=16,8 - 4,8 + 3,2-4,2=11