x2 |
4 |
A.(±
| B.(0,±
| C.(±
| D.(0,±
|
x2 |
4 |
a2+b2 |
5 |
5 |
x2 |
2+m |
y2 |
m+1 |
A.(-∞,-2)∪(-1,+∞) | B.(-∞,-2) |
C.(-1,+∞) | D.(-2,-1) |
A.y=±
| B.y=±
| C.y=±
| D.y=±
|
x2 |
16 |
y2 |
b2 |
5 |
4 |
A.y=±
| B.y=±
| C.y=±
| D.y=±
|
x2 |
9 |
y2 |
27 |
A.1 | B.13 | C.5或13 | D.1或13 |
x2 |
16 |
y2 |
64 |
A.50 | B.24 | C.-50 | D.-24 |
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