x2 |
a2 |
y2 |
b2 |
A.5 | B.
| C.
| D.
|
x2 |
a2 |
y2 |
b2 |
b |
a |
b |
a |
a2+b2 |
5a2 |
5 |
c |
a |
| ||
a |
5 |
b |
a |
A.在x轴上 |
B.在y轴上 |
C.党a>b时在x轴上,当a>b时在y轴上 |
D.不能确定在x轴上还是在y轴上 |
x2 |
2 |
y2 |
4 |
A.y=±2x | B.y=±
| C.y=±
| D.y=±
|
2 |
A.
| B.
| C.x2-
| D.x2-y2=1 |
x2 |
m |
y2 |
n |
5 |
3 |
PA |
PB |
A.4 | B.3 | C.2 | D.
|
x2 |
4 |
5 |
5 |
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