请问各位高人,已知x2_3x+1=0,求x2⼀x4+x2+1的值。怎么解?急!急!谢谢!!

2025-01-03 19:33:15
推荐回答(2个)
回答1:

x^2-3x+1=0
x+1/x=3
(x+1/x)^2=x^2+1/x^2+2=9
x^2+1/x^2=7
x2/x4+x2+1=1/(x^2+1/x^2+1)=1/(7+1)=1/8

回答2:

没看懂题