练习题 向量a=(1,-2),b=(6,3),则a与b的夹角为A.60°B.90° C.120° D.150... 来源:语文精选馆 6.48K 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 B6 A1