(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
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u×v<br />
√ =<br />
35 1<br />
√ (−e4 − 5e2 − 3e3)<br />
35<br />
u 5 <br />
v<br />
u×v<br />
5 √<br />
<br />
35<br />
¡ ¡ u v ¡ <br />
(2, −1, 1) C = (−1, 2, 3)<br />
¡ ¨ ¡ ¢ ¡ A = (1, 2, 3)<br />
B =<br />
<br />
¨¥ ¨<br />
−→<br />
AB = B − A = (1, −3, −2)<br />
−→<br />
AC = C − A = (−2, 0, 0)<br />
<br />
−→<br />
AB × −→<br />
AC =<br />
¡<br />
<br />
<br />
<br />
<br />
e1 e2 e3<br />
1 −3 −2<br />
−2 0 0<br />
= 4e2 − 6e3<br />
¢¢¡ <br />
−→<br />
AB× −→<br />
AC<br />
2<br />
=<br />
<br />
<br />
<br />
= − <br />
√ (4) 2 +(−6) 2<br />
2<br />
1 −2<br />
−2 0<br />
<br />
<br />
e2 +<br />
<br />
<br />
<br />
= √ 52<br />
2 = √ 13<br />
1 −3<br />
−2 0<br />
<br />
<br />
e3<br />
¡ ¨ <br />
<br />
u = e1 + e2, v = e2 + e3 w = e1 + e2<br />
¨¥ ¨ <br />
<br />
<br />
u × v = <br />
<br />
e1 e2 e3<br />
1 1 0<br />
0 1 1<br />
<br />
<br />
<br />
=<br />
<br />
<br />
<br />
<br />
1 0<br />
1 1<br />
<br />
<br />
<br />
e1<br />
<br />
<br />
− <br />
<br />
= e1 − e2 + e3<br />
1 0<br />
0 1<br />
<br />
<br />
<br />
e2<br />
<br />
<br />
+ <br />
<br />
1 1<br />
0 1<br />
<br />
<br />
<br />
e3<br />
121