求详细解答啊。 高数要补考根本不会啊
1个回答
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lim<n-∞> (1+1/n+1/n²)^(2n+1)
=lim<n-∞> [1+(1+n)/n²]^(2n+1)
=lim<n-∞> [1+1/[n²/(1+n) ]]^[n²/(1+n)*(2n+1)/n²/(1+n)]
=e^{lim<n-∞>(2n+1)(1+n)/n²
=e²
(2)属于0/0型号 洛比他法则
=lim (1-cosx^2)/(5x^4)
=lim 2xsinx^2)/(20x^3)
=lim 2x³/(20x³)
=1/10
=lim<n-∞> [1+(1+n)/n²]^(2n+1)
=lim<n-∞> [1+1/[n²/(1+n) ]]^[n²/(1+n)*(2n+1)/n²/(1+n)]
=e^{lim<n-∞>(2n+1)(1+n)/n²
=e²
(2)属于0/0型号 洛比他法则
=lim (1-cosx^2)/(5x^4)
=lim 2xsinx^2)/(20x^3)
=lim 2x³/(20x³)
=1/10
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