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设非零向量,满足||=||=|+|,则与-的夹角为A.30°B.60°C.120°D.15...
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设非零向量
,
满足|
|=|
|=|
+
|,则
与
-
的夹角为( )
A.30°
B.60°
C.120°
D.150°
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已知非零向量,,满足++=0,向量与夹角为120°,且||=2||,则向量与的夹角为( )
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已知非零向量,,满足++=0,向量与夹角为120°,且||=2||,则向量与的夹角为( )
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已知非零向量,,满足++=0,向量与夹角为120°,且||=2||,则向量与的夹角为( )
A.60°
B.90°
C.120°
D.150°
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已知非零向量,,满足++=0,向量与夹角为120°,且||=2||,则向量与的夹角为( )
A.60°
B.90°
C.120°
D.150°