已知x的平方-3x+1=0,求分式x的平方⼀x的四次方+x的平方+1

2024-12-28 23:07:00
推荐回答(1个)
回答1:

1)由X^2-3X+1=0可知x不等于0
两边除以x得X+1/X=3
X^2/(X^4+x^2+1)
=1/(x^2+1+1/X^2)
=1/[(X+1/X)^2-2+1]
=1/(9-1)
=1/8
2)由X^2-3X+1=0可知x不等于0
两边除以x得X+1/X=3
X^2/X^4+x^2+1
=1/x^2+x^2+1
=(1/x+x)^2-2+1
=9-1
=8