x2 |
4 |
y2 |
3 |
PF |
QF |
x2 |
4 |
y2 |
3 |
12 |
3+4k2 |
(1+k2)[(x1+x2)2-4x1x2] |
|
k | ||
|
1 |
2 |
1 |
2 |
k | ||
|
|
2
| ||
|
2
| ||||
|
3 |
3 |
3 |
1 |
2 |
3 |
3 |
3 |
PF |
3 |
QF |
3 |
PF |
QF |
3 |
3 |
x2 |
4 |
y2 |
3 |
A.8 | B.9 | C.11 | D.12 |
x2 |
9 |
y2 |
25 |
A.5 | B.6 | C.10 | D.50 |
x2 |
k+8 |
y2 |
9 |
1 |
2 |
A.4 | B.-
| C.4或-
| D.-4或
|
π |
3 |
2 |
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