向量a=(1,-2),b=(6,3),则a与b的夹角为A.60°B.90° C.120° D.150...
问题详情:
向量a = (1,-2),b = (6,3),则a与b的夹角为
A.60° B.90° C.120° D.150°
【回答】
B
知识点:平面向量
题型:选择题
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