k2+1 |
OA |
OB |
3 |
5 |
3 |
4 |
2 |
2 |
2 |
x2 |
a2 |
y2 |
b2 |
2 |
x2 |
2 |
k2+1 |
|
4kt |
2k2+1 |
2t2-2 |
2k2+1 |
OA |
OB |
k2+1 |
2k2+1 |
k2+1 |
2k2+1 |
3 |
5 |
3 |
4 |
3 |
5 |
k2+1 |
2k2+1 |
3 |
4 |
1 |
2 |
1+k2 |
(x1+x2)2-4x1x2 |
1+k2 |
2
| ||
2k2+1 |
|t| | ||
|
| ||
|
1 |
2 |
k2+1 |
| ||
2k2+1 |
|
|
1 |
2 |
1 |
2 |
| ||
4 |
2
| ||
5 |
A.椭圆的一部分 | B.双曲线的一部分 |
C.抛物线的一部分 | D.一条线段 |
| ||
2 |
2
| ||
3 |
OP |
OA |
OB |
x2 |
a2 |
y2 |
b2 |
3 |
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