ax+b |
1+x2 |
1 |
2 |
ax+b |
1+x2 |
1 |
2 |
x |
1+x2 |
x2 |
x22+1 |
x1 |
x12+1 |
(x2-x1)(1-x1x2) |
(x12+1)(x22+1) |
x | 21 |
x | 22 |
2 |
3 |
2 |
3 |
2 |
3 |
A.a>0 | B.0<a<1 | C.0<a<1或a≥5 | D.1<a≤5 |
f(a)+f(b) |
a+b |
1 |
2 |
1 |
x-1 |
A.-7 | B.1 | C.17 | D.25 |
-x2+4x-3 |
A.[1,3] | B.[2,3] | C.[1,2] | D.(-∞,2] |
A.
| B.-1 | C.
| D.3 |
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