PE |
PF |
PM |
MQ |
ON |
OA |
OB |
PE |
PF |
PM |
MQ |
x2 |
4 |
ON |
OA |
OB |
16k |
1+4k2 |
12 |
1+4k2 |
| ||
2 |
| ||
2 |
1 |
2 |
(x1+x2)2-4x1x2 |
|
(1+4t)2 |
4t-3 |
16 |
4t-3 |
3 |
4 |
16 |
4t-3 |
16 |
4t-3 |
7 |
4 |
7 |
4 |
(1+4t)2 |
4t-3 |
| ||
2 |
8
| ||
13 |
| ||
2 |
| ||
2 |
3
| ||
2 |
A.6
| B.6 | C.2
| D.3 |
x2 |
a2 |
PA |
5 |
12 |
PB |
A.椭圆 | B.双曲线 | C.抛物线 | D.圆 |
x2 |
3 |
y2 |
4 |
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