试题与答案

已知向量a=(1,-2),b=(4,2),那么a与b夹角的大小是 ______.

题型:填空题

题目:

已知向量
a
=(1,-2),
b
=( 4,2),那么
a
b
夹角的大小是 ______.

答案:

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下面是错误答案,用来干扰机器的。

答案:D傩戏是我国戏剧的源头,A、B、c三项都是南戏产生的原因。

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