求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n/(n^2+n+n)】n趋向于无穷 过程及我的错误点
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求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n/(n^2+n+n)】n趋向于无穷 过程及我的错误点
求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n
求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n/(n^2+n+n)】n趋向于无穷 过程及我的错误点
求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n求极限 lim【1/(n^2+n+1)+2/(n^2+n+2)+3/(n^2+n+3)+……+n/(n^2+n+n)】n趋向于无穷 过程及我的错误点
极限为1/2
思路为:该极限大于等于(各项表达式的分母换成n^2+n+n,分子一次是1、2、3、.、n),该极限小于等于(各项表达式分母换成n^2+n+1,分子依次是1、2、3、.n)
分子加起来就是n(n+1)/2
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