x2 |
2-x2 |
x2 |
2-x2 |
t+1 |
2-(t+1) |
1+t |
1-t |
1+x |
1-x |
1-x |
1+x |
1+x |
1-x |
2x-1 |
2x+1 |
2x-1 |
2x+1 |
2 |
2x+1 |
2 |
2x+1 |
2 |
2x+1 |
13π |
4 |
1 |
5 |
A.恒为正值 | B.等于0 | C.恒为负值 | D.不大于0 |
A.当a<0时,没有实根 |
B.当0<a<e时,有一个实根(e≈2.7) |
C.当a=e时,有三个实根 |
D.当a>e时,有两个实根 |
1 |
2 |
|
|
1 |
4 |
A.9 | B.
| C.-9 | D.-
|
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