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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
收錄日期: 2021-04-16 01:01:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100827000051KK01872