x趋于0,lim(1+x/1-x)指数是1/x,麻烦给出过程。
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不清楚括号内是1+x/(1-x)还是(1+x)/(1-x)
不管是哪个都是1^∞极限, 用重要极限lim(x→0) (1+x)^(1/x)=e
lim(x→0) [1+x/(1-x)]^(1/x)
=lim(x→0) [1+x/(1-x)]^{[(1-x)/x]*[x/(1-x)]*(1/x)}
=e^ lim(x→0) [1/(1-x)]
=e
lim(x→0) [(1+x)/(1-x)]^(1/x)
=lim(x→0) [1+2x/(1-x)]^{[(1-x)/2x]*[2x/(1-x)]*(1/x)}
=e^ lim(x→0) [2/(1-x)]
=e^2
不管是哪个都是1^∞极限, 用重要极限lim(x→0) (1+x)^(1/x)=e
lim(x→0) [1+x/(1-x)]^(1/x)
=lim(x→0) [1+x/(1-x)]^{[(1-x)/x]*[x/(1-x)]*(1/x)}
=e^ lim(x→0) [1/(1-x)]
=e
lim(x→0) [(1+x)/(1-x)]^(1/x)
=lim(x→0) [1+2x/(1-x)]^{[(1-x)/2x]*[2x/(1-x)]*(1/x)}
=e^ lim(x→0) [2/(1-x)]
=e^2
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