1 |
2 |
OM |
ON |
x2 |
a2 |
y2 |
b2 |
|
|
x2 |
4 |
y2 |
3 |
1 |
k |
|
1 |
4 |
1 |
k |
1 |
4 |
1 |
4 |
1 |
2 |
1 |
2 |
16k |
3+4k2 |
x1+x2 |
2 |
8k |
3+4k2 |
6 |
3+4k2 |
8k |
3+4k2 |
6 |
3+4k2 |
8(-
| ||
3+4(-
|
6 | ||
3+4(-
|
| ||
3+
|
6 | ||
3+
|
OM |
ON |
8k |
3+4k2 |
| ||
3+
|
6 |
3+4k2 |
6 | ||
3
|
28 | ||
25+12(k2+
|
1 |
4 |
1 |
k2 |
17 |
4 |
4 |
7 |
28 | ||
25+12(k2+
|
7 |
19 |
OM |
ON |
4 |
7 |
7 |
19 |
3 |
x2 |
a2 |
y2 |
b2 |
A.
| B.
| C.
| D.4-2
|
| ||
2 |
a |
b |
A.当s=1时,E是椭圆 | B.当s=-1时,E是双曲线 |
C.当s=0时,E是抛物线 | D.当s=0时,E是一个点 |
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