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批踢踢實業坊 ask 板

[請問] 這個Sigma怎麼解?

Nov 27th 2014, 16:25, by cruise5566

作者cruise5566 (克魯斯56)

看板ask

標題[請問] 這個Sigma怎麼解?

時間Thu Nov 27 16:25:22 2014

http://i.imgur.com/4nOWJH8.jpg

請問這個Sigma整理後就是： (a(a+1)/2)* (b(b+1)/2)* (c(c+1)/2)* (d(d+1)/2)* (e(e+1)/2) ？自己算了好幾次但還是不確定 ----- Sent from JPTT on my HTC_B810x. -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.139.131.124 ※ 文章網址: http://www.ptt.cc/bbs/ask/M.1417076725.A.67A.html

→ wxtab019: 和他無關的就當作常數提出去就好所以沒錯 11/27 16:35

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