> 数学 >
已知
x
x2+x+1
=a
(a≠0且a≠
1
2
),试求分式
x2
x4+x2+1
的值.
人气:260 ℃ 时间:2020-03-25 19:52:09
解答
x
x2+x+1
=
1
x+
1
x
+1
=a,
∴x+
1
x
=
1
a
-1,
则原式=
1
x2+
1
x2
+1
=
1
(x+
1
x
)2−1
=
1
(
1
a
−1)2−1
=
1
1
a2
2
a
=
a2
1−2a
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