已知x2+x+1=0,求x4+1/x4的值

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已知x2+x+1=0,求x4+1/x4的值

已知x2+x+1=0,求x4+1/x4的值
已知x2+x+1=0,求x4+1/x4的值

已知x2+x+1=0,求x4+1/x4的值
x^2+x+1=0,x不等于0
方程两边÷x,
x+1+1/x=0
x+1/x=-1
(x+1/x)^2=1
x^2+1/x^2+2=1
x^2+1/x^2=-1
X^4+1/X^4
=(X^2+1/X^2)^2-2
=(-1)^2-2
=-1

x+1+1/x=0
x+1/x=-1
(x+1/x)^2=1
x^2+1/x^2+2=1
x^2+1/x^2=-1
X^4+1/X^4
=(X^2+1/X^2)^2-2
=(-1)^2-2
=-1