题目内容
已知向量
=(2,-1,3),
=(-4,2,x),若
⊥
,则x=______.
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| b |
| a |
| b |
∵向量
=(2,-1,3),
=(-4,2,x),
⊥
,则
•
=-8-2+3x=0,解得 x=
,
故答案为
.
| a |
| b |
| a |
| b |
| a |
| b |
| 10 |
| 3 |
故答案为
| 10 |
| 3 |
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