2 |
3 |
1 |
3 |
2 |
3 |
1 |
3 |
3 |
3 |
3 |
3 |
-a±
| ||
3 |
-a-
| ||
3 |
-a+
| ||
3 |
-a-
| ||
3 |
-a+
| ||
3 |
2 |
3 |
1 |
3 |
-1-3x2 |
x |
2 |
3 |
1 |
3 |
-1-3x2 |
x |
2 |
3 |
| ||
3 |
| ||
3 |
1 |
3 |
-1-3x2 |
x |
|
|
|
|
|
2 |
3 |
1 |
3 |
2 |
3 |
1 |
3 |
2 |
3 |
1 |
3 |
4 |
3 |
4 |
3 |
A.(-∞,0) | B.(-∞,1) | C.(0,+∞) | D.(1,+∞) |
1 |
3 |
1 |
x |
m+n |
n |
1 |
2 |
A.(0,+∞) | B.(-1,0)和 (2,+∞) |
C.(2,+∞) | D.(-1,0) |
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