(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
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(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H

(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H

(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H

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−→<br />

OA × −→<br />

OB =<br />

=<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

e1 e2 e3<br />

0 k −3<br />

−1 0 −4<br />

k −3<br />

0 −4<br />

<br />

<br />

<br />

<br />

<br />

<br />

e1 − <br />

= −4ke1 + 3e2 + ke3<br />

0 −3<br />

−1 −4<br />

<br />

<br />

e2 +<br />

<br />

<br />

<br />

0 k<br />

−1 0<br />

<br />

<br />

e3<br />

<br />

<br />

−→<br />

OA × −→ −→<br />

<br />

<br />

OB | OC<br />

= |−4k + 3k − 3k| = |−4k| = 4|k|<br />

[OA] [OB] [OC] ¡<br />

¡ ¢ 6 k ¢ <br />

4|k| = 6 ⇐⇒ |k| = 3<br />

2<br />

⇐⇒ k = ± 3<br />

2<br />

O A B £¢ <br />

C<br />

<br />

<br />

−→<br />

OA × −→ −→<br />

<br />

<br />

OB | OC<br />

= 0 ⇐⇒ 4|k| = 0 ⇐⇒ k = 0<br />

123

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