x2 |
3 |
A.-
| B.
| C.-
| D.
|
1 |
3 |
1 |
3 |
| ||
2 |
| ||
2 |
| ||
2 |
| ||
2 |
1-tan2θ |
1+tan2θ |
1-
| ||
1+
|
1 |
3 |
x2 |
a2 |
A.
| B.
| C.2 | D.
|
x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
π |
3 |
OM |
MN |
FA |
1 |
3 |
AN |
x2 |
16 |
y2 |
9 |
A.12 | B.20 | C.9 | D.16 |
x2 |
16 |
y2 |
9 |
A.5 | B.
| C.
| D.
|
y2 |
a |
A.∀a∈R+,方程C表示椭圆 |
B.∀a∈R-,方程C表示双曲线 |
C.∃a∈R-,方程C表示椭圆 |
D.∃a∈R,方程C表示抛物线 |
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