向量的数量积-天气预报

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向量的数量积

更新时间： 2021-06-02 11:46:16

1、已知两个非零向量a、b，那么|a||b|cosθ（θ是a与b的夹角）叫做a与b的数量积或内积。记作a·b。

2、两个向量的数量积等于它们对应坐标的乘积的和。即：若a=(x1,y1),b=(x2,y2)，则a·b=x1·x2+y1·y2。

关键词：向量数量

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