x2 |
4 |
y2 |
3 |
x2 |
4 |
y2 |
3 |
a2-b2 |
|
6m |
4+3m2 |
y1+y2 |
2 |
3m |
4+3m2 |
1 |
2 |
|3m| |
2(4+3m2) |
3 | ||
2(
|
3 | ||
2×2
|
| ||
8 |
2
| ||
3 |
| ||
8 |
2
| ||
3 |
x2+y2-4x+6y+13 |
x2+y2+6x+4y+13 |
26 |
y-1 |
x-3 |
A.(-∞,
| B.(-∞,
| C.[
| D.[
|
x2 |
2 |
1 |
2 |
1 |
2 |
x2 |
7 |
y2 |
5 |
A.0 | B.1 | C.2 | D.1或2 |
x2 |
4 |
y2 |
2 |
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