limn→正无穷 n[(1+1/n)∧n-e]

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limn→正无穷 n[(1+1/n)∧n-e]
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limn→正无穷 n[(1+1/n)∧n-e]
limn→正无穷 n[(1+1/n)∧n-e]

limn→正无穷 n[(1+1/n)∧n-e]
Taylor展式:ln(1+1/n)=1/n-1/(2n^2)+小o(1/n^2),e^(-1/(2n)+小o(1/n))=1-1/(2n)+小o(1/n).
lim n[(1+1/n)^n-e]=lim n[e^(nln(1+1/n))-e]=lim n[e^(1-1/(2n)+小o(1/n))-e]=lim en[e^(-1/(2n)+小o(1/n))-1]=lim ne[-1/(2n)+小o(1/n)]=-e/2.