已知 x^2 + x +1 = 0 ,则 1 + x^10 + x^20 + …+ x^110 =
问题描述:
已知 x^2 + x +1 = 0 ,则 1 + x^10 + x^20 + …+ x^110 =
答
x^2 + x +1 = 0==>X^3-1=(X-1)*(x^2 + x +1)=0
X^3-1=0
X^3=1
1 + x^10 + x^20 + …+ x^110
=1+X+X^2+1+X+X^2+1+X+X^2+1+X+X^2=0