问题标题:
lim[1/n-1/(n+1)+1/(n+2)-1/(n+3)+...+1/(2n-1)-1/2n]n趋于无穷的极限
问题描述:

lim[1/n-1/(n+1)+1/(n+2)-1/(n+3)+...+1/(2n-1)-1/2n]n趋于无穷的极限

冯立回答:
  lim[1/n-1/(n+1)+1/(n+2)-1/(n+3)+...+1/(2n-1)-1/2n]   =lim[1/n(n+1)+1/(n+2)(n+3)+...+1/(2n-1)2n]   n/(2n-1)2n
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