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數學問題:數論(20分)

發問:

there are n integer, their sum is 0, product is n, Prove that n is divisible by 4. 要詳盡解釋.唔該.

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====================================================== 圖片參考:http://img717.imageshack.us/img717/88/13273662.png 2010-04-28 22:41:42 補充: http://img717.imageshack.us/img717/88/13273662.png

其他解答:

這裏可以幫到你 http://actioni.w7.c361.net/yahoo.com.hk/hk/auction/178987536|||||nelson好勁...仲可以計到個數出黎~|||||2 is not divisible by 4 !!|||||This is wrong. Take n = 2, let a, b be the 2 integers. a + b = 0 ab = 2 a+b = 0 implies a = -b implies 2 = ab = -a^2 < 0. Contradiction!5AEEC82B53E1B405
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