(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
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¢ u v ¢ ¡ α = 2<br />
<br />
<br />
<br />
(1, 1, −1) ′£¢ P<br />
<br />
d (P ′ , P) = d ((1, 1, −1), P) = |1+α×1+2×(−1)+β|<br />
√ 1 2 +α 2 +2 2<br />
= |1+2×1+2×(−1)+β|<br />
√ 1 2 +2 2 +2 2<br />
d (P ′ , P) = 3 ⇐⇒ |1+β|<br />
3<br />
= |1+β|<br />
3<br />
= 3 ⇐⇒ |1 + β| = 9<br />
⇐⇒ β = 8 β = −10<br />
¡ ¨ P ¢ ¢ x − y +<br />
<br />
z − 1 0 = <br />
R<br />
x = 2y − 1 z = −y + 3<br />
¨¥ ¨ R ¡ P ¡ ¥¤ <br />
<br />
z0 = −y0 3 ¢ <br />
+<br />
x0 − y0 + z0 − 1 = 0 ⇐⇒ (2y0 − 1) − y0 + (−y0 + 3) − 1 = 0<br />
(x0, y0, z0) x0<br />
139<br />
= 2y0 − 1 <br />
⇐⇒ 1 = <br />
0<br />
R<br />
¡ P (−1, 0, 3) R<br />
<br />
<br />
¡ ¨ R1<br />
d (R, P) = d ((−1, 0, 3), P) = |−1−0+3−1| √<br />
12 +(−1) 2 +12 = 1 √<br />
3<br />
<br />
z = −2x + 4<br />
y = βx − β<br />
R2<br />
<br />
R1<br />
<br />
<br />
<br />
y = x − 1<br />
z = −2x + 2 + β<br />
<br />
<br />
R2<br />
<br />
¢ ¢ β