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已知||=2,||=4,•(+)=0,则与的夹角是A.30°B.60°C.90°D.120...
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已知|
|=2,|
|=4,
•(
+
)=0,则
与
的夹角是( )
A.30°
B.60°
C.90°
D.120°
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