求:lim(x->0)[1+e-(1+x)^(1/x)]^(1/x)
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求:lim(x->0)[1+e-(1+x)^(1/x)]^(1/x)
lim(x->0)(1+x)^(1/x)=e;
于是式子变为:1^无穷,不定式.
lim(x->0)(1+x)^(1/x)=e;
于是式子变为:1^无穷,不定式.
=limexp{ln[1+e-(1+x)^(1/x)]/x}
=exp{lim[e-(1+x)^(1/x)]/x}(等价无穷小的替换)
=exp{lim[e-e^(ln(1+x)/x)]/x}
=exp{lim[e-e^(1-x/2+o(x))]/x}(泰勒公式求极限)
=exp{elim[1-e^(-x/2+o(x))]/x}
=exp{elim[1-(1-x/2+o(x)]/x}
=exp{elim[1/2+o(1)]}
=exp{e/2}
=exp{lim[e-(1+x)^(1/x)]/x}(等价无穷小的替换)
=exp{lim[e-e^(ln(1+x)/x)]/x}
=exp{lim[e-e^(1-x/2+o(x))]/x}(泰勒公式求极限)
=exp{elim[1-e^(-x/2+o(x))]/x}
=exp{elim[1-(1-x/2+o(x)]/x}
=exp{elim[1/2+o(1)]}
=exp{e/2}
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