(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
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¢¡¤£¦¥ ¡ §<br />
¡ ¢ ¤£¢ ¥ ¡<br />
¡ ¨ § A = (2, 3, 3) ¡ R<br />
¢ <br />
<br />
(x, y, z) = (2, 1, 2) + λ(1, 2, 2), λ ∈ IR<br />
R <br />
P <br />
A<br />
P w = (1, 1, <br />
−1)<br />
(0, 0,<br />
−3)<br />
(1, −1, 0) P<br />
¨¥ ¨ ¢ R <br />
<br />
<br />
B = (2, 1, 1) ∈ R u = (1, 2, ¡ <br />
2)<br />
A = (2, 3)<br />
3,<br />
¡<br />
R<br />
d (A, R) = u×−→ AB<br />
u<br />
−→ <br />
AB = B − A = (0, 1) 2,<br />
£¢<br />
u × −→<br />
AB =<br />
<br />
<br />
<br />
<br />
e1 e2 e3<br />
0 1 2<br />
1 2 2<br />
<br />
<br />
<br />
= 2e1 − e2 − 2e3 = (2, −1, −2)<br />
u × −→<br />
AB = 2 2 + (−1) 2 + (−2) 2 = √ 9 = 3<br />
u = √ 1 2 + 2 2 + 2 2 = √ 9 = 3
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