题目内容
已知f(
)=
+
,则f(x)=( )
| 1+x |
| x |
| x2+1 |
| x2 |
| 1 |
| x |
| A.(x+1)2 | B.(x-1)2 | C.x2-x+1 | D.x2+x+1 |
∵f(
)=
+
=(
)2-(
)+1
∴f(x)=x2-x+1
故选C
| 1+x |
| x |
| x2+1 |
| x2 |
| 1 |
| x |
| 1+x |
| x |
| 1+x |
| x |
∴f(x)=x2-x+1
故选C
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