题目内容
已知平面向量
,
满足|
|=3,|
|=2,
与
的夹角为60°,若(
-m
)⊥
,则实数m=______.
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由题意可得
•
=3×2×cos60°=3,(
-m
)•
=
2-m
•
=9-m×3=0,
∴m=3,
故答案为:3.
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∴m=3,
故答案为:3.
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