当x无限接近1时,求x^1/1-x的极限.

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当x无限接近1时,求x^1/1-x的极限.

lim(x→1)x^1/1-x
=lim(x→1)[1+x-1]^1/1-x
=e的lim(x→1)x-1/1-x
=e的-1次方

e的-1次方

lim(x->1) x^[1/(1-x)]
let
y= 1/(1-x)
x->1, y->无穷
lim(x->1) x^[1/(1-x)]
lim(y->无穷) ( 1- 1/y) ^y
= e^(-1)