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# 奧林匹克數學

對於任意的兩個自然數a 和 b, 規定新運算 “#” 為 :

a#b=a(a+1)(a+2)......(a+b-1)

如果(x#3)#2=3660，那麼x等於多少 ?

急用!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

### 2 Answers

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- 自由自在Lv 71 decade agoFavorite Answer
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圖片參考：http://img535.imageshack.us/img535/539/64185183.pn...

2010-08-27 22:40:16 補充：

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