x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
π |
3 |
OM |
MN |
FA |
1 |
3 |
AN |
x2 |
a2 |
y2 |
b2 |
b |
a |
b |
a |
π |
3 |
π |
6 |
b |
a |
π |
6 |
| ||
3 |
3 |
3 |
x2 |
3 |
OM |
ON |
b |
a |
a |
b |
a |
b |
|
|
a2 |
c |
ab |
c |
FA |
1 |
3 |
AN |
1 |
3 |
a2 |
c |
ab |
c |
|
|
3c2+a2 |
4c |
ab |
4c |
(3c2+a2)2 |
16a2c2 |
a2 |
16c2 |
5±
| ||
9 |
| ||||
3 |
| ||||
3 |
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 |
y2 |
a |
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