>
数学
>
已知
f(x−
1
x
)=
x
2
+
1
x
2
,则函数f(3)=______.
人气:397 ℃ 时间:2019-10-08 14:15:20
解答
令 x-
1
x
=t,t
2
=x
2
+
1
x
2
-2,
∴f(t)=t
2
+2,
∴f(3)=3
2
+2=11;
故答案为11.
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