x2 |
4 |
2 |
OA |
OB |
x2 |
a2 |
y2 |
b2 |
x2 |
3 |
2 |
x2 |
4 |
2 |
2 |
1 |
4 |
2 |
x2 |
3 |
2 |
|
1 |
3 |
6
| ||
1-3k2 |
-9 |
1-3k2 |
OA |
OB |
2 |
2 |
2 |
-9 |
1-3k2 |
2 |
6
| ||
1-3k2 |
3k2+7 |
3k2-1 |
3k2+7 |
3k2-1 |
15k2-13 |
3k2-1 |
13 |
15 |
1 |
3 |
1 |
4 |
13 |
15 |
|
| ||
3 |
1 |
2 |
1 |
2 |
| ||
3 |
|
x2 |
a2 |
y2 |
b2 |
y2 |
2 |
A.存在一条,且方程为2x-y-1=0 |
B.存在无数条 |
C.存在两条,方程为2x±(y+1)=0 |
D.不存在 |
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