(x → 0 时) lim (x+e^x)^1/x谁会?
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(x→0时)lim(x+e^x)^1/x谁会?(x→0时)lim(x+e^x)^1/x谁会?(x→0时)lim(x+e^x)^1/x谁会?结果是:e^2方法一:lim(x+e^x)^1/x(x→0)=
(x → 0 时) lim (x+e^x)^1/x谁会?
(x → 0 时) lim (x+e^x)^1/x谁会?
(x → 0 时) lim (x+e^x)^1/x谁会?
结果是:e^2
方法一:
lim (x+e^x)^1/x (x → 0)
=lim(1+ x+e^x -1)^1/x ……括号里面加减1 变成(1+"0")^∞的形式
=lim(1+ x+e^x -1)^[(1/(x+e^x -1)) *((x+e^x -1)/x)]
=lim e^((x+e^x -1)/x)
=lim e^(1+ (e^x -1)/x) ……再利用等价无穷小代换:x代换 e^x -1
=e^2
方法二:利用洛必达法则
lim (x+e^x)^1/x (x → 0)
=lim e^[ln(x+e^x)^1/x ]
=lim e^[ln(x+e^x) / x]
分子ln(x+e^x)趋近于0 分母x 也趋近于0 同时求导得
(e^x+1)/(x+e^x) = 2 (x → 0,时)
所以
lim (x+e^x)^1/x (x → 0)
=lim e^[ln(x+e^x) / x]
=e^2
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