作业帮从lim(n→∞) (1/n)[1/(3 + 1/n) + 1/(3 + 2/n) + ...+ 1/(3 + n/n)] 怎么变为∫(0→1) dx/(3 + x)
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![从lim(n→∞) (1/n)[1/(3 + 1/n) + 1/(3 + 2/n) + ...+ 1/(3 + n/n)] 怎么变为∫(0→1) dx/(3 + x)](/uploads/image/z/15221477-29-7.jpg?t=%E4%BB%8Elim%28n%E2%86%92%E2%88%9E%29+%281%2Fn%29%5B1%2F%283+%2B+1%2Fn%29+%2B+1%2F%283+%2B+2%2Fn%29+%2B+...%2B+1%2F%283+%2B+n%2Fn%29%5D+%E6%80%8E%E4%B9%88%E5%8F%98%E4%B8%BA%E2%88%AB%280%E2%86%921%29+dx%2F%283+%2B+x%29)
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从lim(n→∞) (1/n)[1/(3 + 1/n) + 1/(3 + 2/n) + ...+ 1/(3 + n/n)] 怎么变为∫(0→1) dx/(3 + x)
从lim(n→∞) (1/n)[1/(3 + 1/n) + 1/(3 + 2/n) + ...+ 1/(3 + n/n)] 怎么变为∫(0→1) dx/(3 + x)
从lim(n→∞) (1/n)[1/(3 + 1/n) + 1/(3 + 2/n) + ...+ 1/(3 + n/n)] 怎么变为∫(0→1) dx/(3 + x)
见图片,费了很大劲,请采纳.写得很清楚了.
http://hiphotos.baidu.com/qingshi0902/pic/item/15cb0418b3de9c8244497b336c81800a18d84387.jpg
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