x2 |
45 |
y2 |
20 |
A.[-7,8] | B.[-
| C.[-2,2] | D.(-∞,-7]∪[8,+∞) |
x2 |
45 |
y2 |
20 |
y |
x+5 |
y |
x-5 |
x2 |
45 |
y2 |
20 |
x2 |
45 |
25-x2 |
20 |
|1-2m| |
5 |
|1-2m| |
5 |
x2 |
12 |
y2 |
8 |
A.(
| B.(
| C.(-
| D.(-
|
41 |
A.3 | B.
| C.
| D.
|
x2 |
8 |
y2 |
4 |
1-2x2 |
x2 |
a2 |
y2 |
b2 |
1 |
2 |
y2 |
2 |
OA |
OB |
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