题目内容
已知
=(6,2),
=(-3,m),当m为何值时,
(1)
∥
?
(2)
⊥
?
| a |
| b |
(1)
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| b |
(2)
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| b |
由
=(6,2),
=(-3,m),
(1)若
∥
,则6m-(-3)×2=0,解得m=-1;
(2)若
⊥
,则6×(-3)+2m=0,解得m=9.
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(1)若
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(2)若
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