| ||
3 |
x2 |
a2 |
y2 |
b2 |
| ||
3 |
a2-b2 |
a2 |
2 |
3 |
1 |
a2 |
1 |
b2 |
4 |
3 |
x2 |
4 |
3y2 |
4 |
6x0 |
3x02+y02 |
3-4y02 |
3x02+y02 |
x02 |
y02 |
x0 |
y02 |
1 |
y02 |
x02 |
y02 |
3-4y02 |
3x02+y02 |
x0 |
y02 |
6x0 |
3x02+y02 |
1 |
y02 |
A.-4 | B.-4或0 | C.0或4 | D.4 |
A.x+y-4=0 | B.x-2y-1=0 | C.x-y-2=0 | D.2x-y-5=0 |
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