发布网友 发布时间:2024-10-11 14:05
共1个回答
热心网友 时间:2024-11-16 07:25
lim(x->0) (1+x)^(1/x) =lim(x->0) e^ [ln(1+x)/x] =lim(x->0) e^ [( x-(1/2)x^2)/x ] =lim(x->0) e^[1-(1/2)x] lim(x->0) (1+2x)^[1/(2x)] =lim(x->0) e^ [(ln(1+2x)/(2x)] =lim(x->0) e^{ [ (2x) -(1/2)(2x)^2]/(2x) } =lim(x->0) e^(1 - x) / lim(x->0) { (1+x)^(1/x) - (1+2x)^[1/(2x)] }/ x =lim(x->0) { e^[1-(1/2)x] - e^(1-x) } / x (0/0) =lim(x->0) { -(1/2)e^[1-(1/2)x] + e^(1-x) } = -(1/2)e + e =(1/2)e