已知函数f（x）=3/(x2+1),那么f（根号2）=几

已知函数f（x）=3/(x2+1),那么f（根号2）=几
已知函数f（x）=3/(x2+1),那么f（根号2）=几

已知函数f（x）=3/(x2+1),那么f（根号2）=几
f（x）=3/(x2+1) x2应该是x²吧?
=3/(x²+1)
=3/[(√2)²+1]
=3/[2+1]
=3/3
=1