Contact us
Choose a category below so we can get back to you as quickly as possible.
令 |向量OA|=|a|=3,|向量OB|=|b|=3 則(|向量OA+向量OB|)^2=|a+b|^2=|a|^2+|b|^2+2a*b=9+9+2*3*3*cos60°=27 則|向量OA+向量OB|=|a+b|=3√3
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.