题目内容
已知
=(l,2),
=(x,6),且
∥
,则|
-
|=______.
| a |
| b |
| a |
| b |
| a |
| b |
∵
=(l,2),
=(x,6),且
∥
,∴2x-1×6=0,解得 x=3.
∴
-
=(-2,-4),∴|
-
|=
=2
,
故答案为 2
| a |
| b |
| a |
| b |
∴
| a |
| b |
| a |
| b |
| 4+16 |
| 5 |
故答案为 2
| 5 |
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题目内容
| a |
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| a |
| b |
| a |
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| a |
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| a |
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| a |
| b |
| a |
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| 4+16 |
| 5 |
| 5 |