x2 |
2 |
OA |
OB |
2 |
3 |
OA |
OB |
2 |
3 |
3 |
4 |
|b| | ||
|
k2+1 |
k2+1 |
|
4kb |
2k2+1 |
2b2-2 |
2k2+1 |
OA |
OB |
k2+1 |
2k2+1 |
2 |
3 |
k2+1 |
2 |
2 |
k2+1 |
2k2+1 |
2 |
3 |
3 |
4 |
2 |
3 |
k2+1 |
2k2+1 |
3 |
4 |
1 |
2 |
k2+1 |
2
| ||
2k2+1 |
| ||
2k2+1 |
|b| | ||
|
b | ||
|
1 |
2 |
| ||
2k2+1 |
2k4+2k2 |
4k4+4k2+1 |
1 |
2 |
1 |
2(2k2+1)2 |
1 |
2 |
| ||
4 |
2 |
3 |
PA |
PB |
a |
b |
c |
a |
b |
a |
c |
b |
c |
A.相等 | B.共线 | C.垂直 | D.不确定 |