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(1+x+x^2+....+x^18)^10
Jun 4th 2013, 17:41

知識問題|

發問者： 月下隱者 ( 大師 2 級)
擅長領域： 數學 | 數學
發問時間： 2013-06-05 01:41:10 ( 還有 1 天發問到期 )
解答贈點： 20 ( 共有 0 人贊助 )
回答： 0 0

(1+x+x^2+....+x^18)^10展式中x^15的系數為C(n,9)  , n=

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