2 |
2 |
y2 |
a2 |
x2 |
b2 |
a |
b |
2 |
y2 |
4 |
x2 |
2 |
2 |
2 |
2 |
2 |
2 |
|
2 |
2 |
2k2-2
| ||
k2+2 |
k2-2
| ||
k2+2 |
k2+2
| ||
k2+2 |
y1-y2 |
x1-x2 |
k(x1+x2)-2k |
x1-x2 |
k
| ||||
|
-8k | ||
-4
|
2 |
x2 |
4 |
y2 |
3 |
A.点P在椭圆C内 | B.点P在椭圆C上 |
C.点P在椭圆C外 | D.以上三种均有可能 |
1 |
2 |
x2 |
a2 |
y2 |
b2 |
| ||
5 |
5 |
40 |
9 |
x2 |
a2 |
y2 |
b2 |
| ||
2 |
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