x2 |
a2 |
y2 |
b2 |
40 |
3 |
x | 20 |
b |
a |
b |
a |
x | 20 |
b |
a |
b |
2a |
b2 |
2a2 |
c2 |
a2 |
5 |
x | 20 |
x | 20 |
5 |
1 |
2 |
5 |
|
5 |
2
| ||
15 |
7 |
5 |
1+(-
|
(xA+xB)2-4xAxB |
|
(-
|
8 |
3 |
5 |
4 |
3 |
5 |
40 |
3 |
5 |
5 |
5 |
5 |
5 |
5 |
5 |
5 |
x2 |
20 |
y2 |
80 |
x2 |
a2 |
y2 |
b2 |
1 |
4 |
A.2
| B.3 | C.2 | D.
|
3 |
x2 |
a2 |
y2 |
b2 |
A.[2,+∞) | B.(2,+∞) | C.(1,
| D.(
|
x2 |
a2 |
y2 |
b2 |
A.(1,
| B.(
| C.(1,2) | D.(2,+∞) |
x2 |
a2 |
y2 |
b2 |
2x-1 |
A.
| B.
| C.2 | D.2
|
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