A.-
| B.-6 | C.6 | D.
|
. |
m |
n |
m |
n |
m |
n |
1 |
2 |
a |
AB |
A.(-9,-7,7) | B.(18,17,-17) | C.(9,7,-7) | D.(-14,-19,31) |
a |
b |
c |
a |
b |
c |
A.(16,0,-23) | B.(28,0,-23) | C.(16,-4,-1) | D.(0,0,9) |
a |
CA |
b |
CB |
a |
b |
A.(5,-9,2) | B.(-5,9,-2) | C.(5,9,-2) | D.(5,-9,-2) |
CA |
CB |
A.-11 | B.3 | C.4 | D.15 |
OA |
OB |
OC |
MA |
MB |
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