x^k·x^(1/3)/(x^3 + 1)^3
ritrascrivo come:
x^((3·k + 1)/3)/(x^9·(1 + 1/x^3)^3)
deve quindi essere:
(3·k + 1)/3 - 9 = 3----> k = 35/3
verifica:
LIM(x^(35/3)·x^(1/3)/(x^3 + 1)^3/x^3)=1
x--> +∞
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