x2 |
9 |
y2 |
16 |
A.3x+4y-15=0 | B.3x-4y-15=0 | C.4x-3y+20=0 | D.4x-3y-20=0 |
x2 |
9 |
y2 |
16 |
4 |
3 |
4 |
3 |
x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
3 |
x2 |
4+k |
y2 |
1-k |
A.(1,+∞) | B.(-∞,-4) | ||||
C.(-4,-
| D.(-∞,-4)∪(1,+∞) |
x2 |
a2 |
y2 |
b2 |
A.相交 | B.相离 | C.相切 | D.不确定 |
x2 |
a2 |
y2 |
b2 |
2
| ||
3 |
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