已知x/x2-x+1=7,则x2x4+x2+1= _ .
问题描述:
已知
=7,则x
x2-x+1
= ___ .x2
x4+x2+1
答
由题意得:
=
x2-x+1 x
,即x+1 7
=1 x
,8 7
=x2+
x4+x2+1 x2
+1=(x+1 x2
)2-2+1=1 x
,15 49
其倒数
=x2
x4+x2+1
.49 15
故答案为:
.49 15