x2 |
a2 |
y2 |
b2 |
3 |
3 |
c2-b2 |
2 |
b |
a |
| ||
2 |
| ||
2 |
x2 |
4+k |
y2 |
1-k |
A.(1,+∞) | B.(-∞,-4) | ||||
C.(-4,-
| D.(-∞,-4)∪(1,+∞) |
x2 |
a2 |
y2 |
b2 |
A.相交 | B.相离 | C.相切 | D.不确定 |
x2 |
a2 |
y2 |
b2 |
2
| ||
3 |
A.2 | B.
| C.
| D.2
|
x2 |
2+m |
y2 |
m+1 |
A.m<2 | B.1<m<2 |
C.m<-2或m>-1 | D.m<-1或1<m<2 |
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