b3-3b2+3b-1 это (b-1)^3
(b-1)^3/b/((1+b)/b)=(b-1)^3/(b+1)
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b3-3b2+3b-1 это (b-1)^3
(b-1)^3/b/((1+b)/b)=(b-1)^3/(b+1)