x2 |
4 |
x2 |
3 |
2 |
OA |
OB |
2 |
x2 |
4 |
2 |
2 |
1 |
4 |
2 |
x2 |
3 |
2 |
|
1 |
3 |
OA |
OB |
2 |
3k2+7 |
3k2-1 |
13 |
15 |
1 |
3 |
1 |
4 |
1 |
3 |
13 |
15 |
|
| ||
3 |
1 |
2 |
1 |
2 |
| ||
3 |
|
1 |
2 |
OA |
OB |
A.-
| B.-
| C.-4 | D.无法确定 |
a |
b |
b |
a |
b |
a |
b |
3 |
a |
y2 |
3 |
PF1 |
PF2 |
AB |
BC |
BC |
AD |
AB |
AD |
AC |
AD |
AB |
A.-4 | B.0 | C.4 | D.8 |
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