幂级数
$\bf计算:$$\lim \limits_{x \to \begin{array}{*{20}{c}}{{1^ - }}\end{array}} {\left( {1 - x} \right)^3}\sum\limits_{n = 1}^\infty {{n^2}{x^n}}$
方法一
$\bf计算:$
posted on 2014-05-23 10:23 142857 阅读(139) 评论(0) 编辑 收藏 举报
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