已知x^2-3x+1=0,则(x^2)⼀(x^4+x^2+1)的值为

2025-03-29 08:46:31
推荐回答(2个)
回答1:

(x^2)/(x^4+x^2+1)
=(x^2)/X^2*(X^2+1)+1
=X^2+1+1
=X^2+2

又X^2-3X+1=0
X^2=3X-1
所以X^2+2=3X-1+2
=3X+1

回答2:

x^2+1=3x
x+1/x=3
x^2+1/x^2+2=9
x^2+1+1/x^2=8
倒数为,原式=1/8