问题描述: Lim[(3x)^1/2] * e^(cos(8pi/ x) ( x-->+0) 求极限? 1个回答 分类:数学 2014-09-29 问题解答: 我来补答 ∵ cos(8π/x) ≤ 1 (x≠0) ,e^x 单调递增;∴ 0 < e^(cos(8π/x)) ≤ e^1 = e∴ 0 < [(3x)^1/2] * e^(cos(8π/x) ≤ [(3x)^1/2]∵ lim(x->0+) [(3x)^1/2] = 0 ,由夹逼定理:∴ lim(x->0+) [(3x)^1/2] * e^(cos(8π/x) = 0 展开全文阅读