代数问题x^2n+x^(2n-1)+……+x+1
答案:1 悬赏:80
解决时间 2021-01-23 10:06
- 提问者网友:心如荒岛囚我终老
- 2021-01-22 17:32
代数问题x^2n+x^(2n-1)+……+x+1
最佳答案
- 二级知识专家网友:等灯
- 2021-01-22 19:07
在复数域上:x^n+x^(n-1)…………x+1=(x-(cos(2π/(n+1))+isin(2π/(n+1)))(x-(cos(4π/(n+1))+isin(4π/(n+1)))……(x-(cos(2nπ/(n+1))+isin(2nπ/(n+1)))在实数域上:当n为奇数时,x^n+x^(n-1)…………x+1=(x+1)(x²-2cos(2π/(n+1))+1)(x²-2cos(4π/(n+1))+1)……(x²-2cos((n-1)π/(n+1))+1)当n为偶数时,x^n+x^(n-1)…………x+1=(x²-2cos(2π/(n+1))+1)(x²-2cos(4π/(n+1))+1)……(x²-2cos(nπ/(n+1))+1)
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