n |
A.(1,-1,1) | B.(1,3,
| C.(1,-3,
| D.(-1,3,-
|
PA |
n |
PA |
PA |
n |
PA |
1 |
2 |
PA |
n |
PA |
1 |
2 |
PA |
n |
PA |
7 |
2 |
PA |
n |
19 |
8 |
5 |
8 |
5 |
8 |
a |
a |
A.(1,-4,2) | B.(
| C.(-
| D.(0,-1,1) |
u |
v |
A.平行 | B.垂直 |
C.相交但不垂直 | D.不能确定 |
a |
a |
A.2 | B.0 | C.1 | D.-1 |
A.(-1,-2,5) | B.(-1,1,-1) | C.(1,1,1) | D.(1,-1,-1) |
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