x2 |
a2 |
A.
| B.
| C.2 | D.
|
x2 |
a2 |
1 |
a2 |
1 |
a2 |
|
|
|
|
FA |
|
FB |
|
FA |
FB |
FA |
FB |
1 |
a2 |
1 |
5 |
1 |
5 |
6 |
5 |
c2 |
a2 |
6 |
6 |
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 |
A.以F1、F2为焦点,以2|F1Q|为长轴长的椭圆上 |
B.以F1、F2为焦点,以2|F1Q|为实轴长的双曲线上 |
C.以F2为焦点,以F1F2中点为顶点的抛物线上 |
D.以F1、F2为焦点,以|F1Q|为实轴长的双曲线上 |
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