3 |
2 |
則
|
∴二次函數(shù)f(x)=x2-x+2,其值域f(x)∈[
7 |
4 |
[f(x)]2+2 |
f(x) |
2 |
f(x) |
f(x)?
|
2 |
當(dāng)且僅當(dāng)f(x)=
2 |
f(x) |
2 |
而
2 |
7 |
4 |
∴當(dāng)f(x)=
7 |
4 |
[f(x)]2+2 |
f(x) |
81 |
28 |
故答案為:
81 |
28 |
3 |
2 |
[f(x)]2+2 |
f(x) |
3 |
2 |
|
7 |
4 |
[f(x)]2+2 |
f(x) |
2 |
f(x) |
f(x)?
|
2 |
2 |
f(x) |
2 |
2 |
7 |
4 |
7 |
4 |
[f(x)]2+2 |
f(x) |
81 |
28 |
81 |
28 |