高等代数x^n+x^(n-1)+…………+ x +1在复数域和实数域上因式分解
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2015-10-30
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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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