1 |
2 |
1 |
2 |
k |
n |
n-k |
n |
1 |
n |
2 |
n |
n-1 |
n |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
2 |
k |
n |
k |
n |
k |
n |
1 |
2 |
k |
n |
n-k |
n |
1 |
2 |
1 |
n |
n-1 |
n |
n-1 |
n |
1 |
n |
1 |
n |
n-1 |
n |
n+1 |
2 |
n+1 |
4 |
1 |
2 |
n+1 |
4 |
1 |
4 |
n |
4 |
n+1 |
4 |
n |
4 |
1 |
4 |
1 |
2 |
A.(0,+∞) | B.(0,
| ||||||
C.(0,
| D.(0,
|
1 |
2 |
A.x|x>2 | B.{x|0<x<
| ||||
C.{x|0<x<
| D.{x|
|
x |
x2+x+1 |
A.②④ | B.①③ | C.③④ | D.①② |
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