Contact us
Choose a category below so we can get back to you as quickly as possible.
這個很好記啊.設兩個向量座標表示分別是(x1,y1,z1)、(x2,y2,z2)(均不是零向量). ①垂直就是點乘為0,只要記住點乘的定義:每個座標分量對應著乘再相加.所以垂直的公式就是x1x2+y1y2+z1z2=0 ②平行就更好記了,就是對應座標分量成比例,x1:x2=y1:y2=z1:z2
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.