1 |
2 |
3 |
OA |
OB |
x2 |
a2 |
y2 |
b2 |
a2-b2 |
| ||
a |
1 |
2 |
3 |
3 |
3 |
x2 |
4 |
y |
3 |
3 |
2 |
3 |
2 |
OA |
OB |
9 |
4 |
5 |
4 |
|m| | ||
|
8km |
4k2+3 |
4m2-12 |
4k2+3 |
3m2-12k2 |
4k2+3 |
OA |
OB |
4m2-12 |
4k2+3 |
3m2-12k2 |
4k2+3 |
-5(k2+1) |
4k2+3 |
5 |
4 |
5 |
4(4k2+3) |
5 |
4(4k2+3) |
5 |
12 |
5 |
3 |
OA |
OB |
5 |
4 |
OA |
OB |
5 |
3 |
5 |
4 |
x2 |
3 |
x2 |
12 |
y2 |
3 |
x2 |
5 |
y2 |
m |
A.[1,5)∪(5,+∞) | B.(0,5) | C.[1,+∞) | D.(1,5) |
x2 |
a2 |
y2 |
b2 |
2 |
| ||
2 |
2 |
π |
4 |
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