奧林匹克數學

2010-08-28 6:16 am
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 ?







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回答 (2)

2010-08-28 6:40 am
✔ 最佳答案
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2010-08-27 22:40:16 補充:
http://img535.imageshack.us/img535/539/64185183.png
2010-08-29 5:45 am
由於a#b之值隨a、b之值增加而增加,且3660之值不大,其實可代入x = 1,2...


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