x2 |
a2 |
y2 |
b2 |
| ||
2 |
|PQ| |
|MN| |
| ||
2 |
b |
a |
| ||
2 |
|
x2 |
4 |
y2 |
3 |
|
8k2 |
3+4k2 |
4k2-12 |
3+4k2 |
1+k2 |
(x1+x2)2-4x1x2 |
1+k2 |
(
|
12(1+k2) |
3+4k2 |
x1+x2 |
2 |
4k2 |
3+4k2 |
4k2 |
3+4k2 |
-3k |
3+4k2 |
3k |
3+4k2 |
4k2 |
3+4k2 |
k2 |
3+4k2 |
k2 |
3+4k2 |
k2 |
3+4k2 |
3(1+k2) |
3+4k2 |
|PQ| |
|MN| |
| ||
|
1 |
4 |
x2 |
a2 |
y2 |
b2 |
|PQ| |
|QB| |
x2 |
a2 |
y2 |
b2 |
1 |
2 |
x2 |
9 |
y2 |
16 |
9 |
x0 |
x2 |
a2 |
y2 |
b2 |
S1 |
S2 |
A.
| B.2
| C.
| D.
|
x2 |
36 |
y2 |
20 |
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