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  \lim_{n \to \infty} \sqrt[n]{n} = 1, \quad \lim_{x \to 0} (1+x)^{\frac{1}{x}} = e.
$$
(1) $\sqrt[n]{n} \leq \sqrt[n]{2n + 1} \leq \sqrt[n]{3n} = \sqrt[n]{3} \cdot \sqrt[n]{n}$, È»ºóÔËÓüбƷ¨Ôò¡£
(2) $\lim\limits_{n \to \infty} \left(1 + \frac{1}{n}\right)^{-n} = \frac{1}{\lim\limits_{n \to \infty} \left(1 + \frac{1}{n}\right)^{n}} = \frac{1}{e}$.
(3) $\left(\frac{n-5}{n}\right)^n = \left\{\left(1 - \frac{-5}{n}\right)^{\frac{n}{-5}}\right\}^{-5}$, ¹Ê$\lim\limits_{n \to \infty} a_n = e^{-5}$.
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(1)Áîp=(2*n+1)^(1/n) , Lnp=ln(2*n+1)/n ,
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