x2 |
5 |
y2 |
m |
A.(0,+∞) | B.(0,15) | C.(15,40) | D.(5,10) |
x2 |
5 |
y2 |
m |
c |
a |
| ||
|
| ||
|
5+m |
5 |
A.4 | B.6 | C.2
| D.10 |
A.(4,0) | B.(2,0) | C.(1,0) | D.(
|
y2 |
16 |
x2 |
9 |
A.x=3 | B.y=-4 | C.x=3或y=-4 | D.x=4或y=-3 |
x2 |
9 |
y2 |
16 |
A.22 | B.16 | C.14 | D.12 |
x2 |
4+k2 |
y2 |
5-k2 |
A.(0,±3) | B.(±3,0) | C.(±1,0) | D.(0,±1) |
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