x2 |
a2 |
y2 |
b2 |
4a2 |
b2-a2 |
4a2+a2b2 |
b2-a2 |
x1+x2 |
2 |
1 |
2 |
4a2 |
b2-a2 |
a2+b2 |
c |
a |
4+3a2 |
2 |
(x1-2a)2+y12 |
(x2-2a)2+y22 |
9 |
5 |
2 |
2 |
(x1+x2)2-4x1x2 |
A.
| B.
| C.
| D.
|
x2 |
a2 |
y2 |
b2 |
π |
2 |
x2 |
m |
y2 |
3 |
A.m>-1且m≠3 | B.0<m<7且m≠3 | C.m>7 | D.m<0 |
x2 |
2 |
4
| ||
3 |
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