The sum of all factors should be constant(no x).

來源: jinjing 2010-09-15 10:20:17 [] [舊帖] [給我悄悄話] 本文已被閱讀: 次 (150 bytes)
In fact,I can do something for n<=5 only by Galois.No matter how strong we are,at last we meet n-1 degree equation,the same as we do using derivative.
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