作者midarmyman (midarmyman)
看板trans_math
标题[张爸]交大
时间Sat Apr 17 13:09:34 2010
3n k^2
lim Σ-------------
n→∞ k=1 2n^3+k^3
我算(ln(29/2))/9
书上最後是除以3
谁对?
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.117.198.78
1F：→ a88241050:除以3没错啊,你怎算的 140.135.32.38 04/17 13:40
2F：→ midarmyman:分开之後原本是1/n 不是要把它改成3/n 140.117.198.78 04/17 14:10
3F：→ midarmyman:再补上1/3的系数?Y 140.117.198.78 04/17 14:11
4F：→ midarmyman:因为他式从0积到3 140.117.198.78 04/17 14:11
5F：→ a88241050:0积到3分成3n等分,所以还是1/n啊 140.135.32.38 04/17 14:41
6F：→ a88241050:S(0~3)x^2/(2+x^3) dx =ln(29/2)/3 140.135.32.38 04/17 14:42
7F：→ midarmyman:OH 我明了 谢了 140.117.198.78 04/17 14:52