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58问答库 > 如何计算向量坐标的乘积，公式是什么

如何计算向量坐标的乘积，公式是什么

2025-03-15 13:47:53

推荐回答（2个）

回答（1）：

向量a=(x1,y1),向量b=(x2,y2)
a·b=x1x2+y1y2=|a||b|cosθ(θ是a,b夹角)
ps:向量之间不叫"乘积",而叫数量积..如a·b叫做a与b的数量积或a点乘b

回答（2）：

向量内积的坐标表达式的推导，即
a·b＝|
a
|
|
b
|
cos‹a，b›与
a·b＝a1b1＋a2b2两个式子的内在联系．

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