FA |
FB |
A.±
| B.±
| C.±
| D.±
|
|
2(2+k2) |
k2 |
4 |
k2 |
4 |
k |
FA |
FB |
FA |
FB |
|
|
3k2-4 |
3k2 |
4 |
3k2 |
4 |
3k |
16 |
9k2 |
3k2-4 |
3k2 |
4 |
3 |
A.2
| B.4 | C.
| D.
|
A.-1或2 | B.2 | C.-1 | D.1+
|
x2 |
a2 |
y2 |
b2 |
A.[
| B.(1,
| C.[2,+∞) | D.(1,2) |
x2 |
4 |
y2 |
3 |
A.(-
| B.(-∞,-
| ||||||||||||||||
C.[-
| D.(-∞,-
|
x2 |
5 |
y2 |
m |
A.m≥1 | B.m≥1,或0<m<1 |
C.0<m<5,且m≠1 | D.m≥1,且m≠5 |
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