Contact us
Choose a category below so we can get back to you as quickly as possible.
設向量AB=a,向量AC=b,向量AM=c向量BM=d,延長AM到D使AM=DM,連接BD,CD,則ABCD為平行四邊形則向量a+b=2c(a+b)平方=4c平方a平方+2ab+b平方=4c平方(1)向量b-a=2d(b-a)平方=4d平方a平方-2ab+b平方=4d平方(2)(1)+…
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.