AB |
AC |
a |
a |
AB |
a |
AB |
a |
AC |
a |
|a| |
x2+y2+z2 |
1 |
3 |
2 |
3 |
2 |
3 |
1 |
3 |
2 |
3 |
2 |
3 |
a |
1 |
3 |
2 |
3 |
2 |
3 |
a |
1 |
3 |
2 |
3 |
2 |
3 |
1 |
3 |
2 |
3 |
2 |
3 |
1 |
3 |
2 |
3 |
2 |
3 |
A.(-1,-2,5) | B.(1,3,2) | C.(1,1,1) | D.(-1,1,-1) |
u |
v |
A.α∥β | B.α⊥β |
C.α,β相交但不垂直 | D.以上均不正确 |
A. | B. | C.或 | D.或 |
A. | B. | C. | D. |
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