函数f(x)=1/(x^2-2x+3)的值域```我郁闷..这题也不会...

问题描述:

函数f(x)=1/(x^2-2x+3)的值域
```我郁闷..这题也不会...

先把分母配方,然后算最值

f(x)=1/(x^2-2x+3)
=1/[(x-1)^2+2]
(x-1)^2+2>=2
所以f(x)=1/(x^2-2x+3)
=1/[(x-1)^2+2]
f(x)的值域(0,1/2]