Help with math problem for linear?
2016-05-14 3:16 am
回答 (1)
2016-05-14 7:56 am
✔ 最佳答案
｜u + v + w｜^2= ( u + v + w )．( u + v + w )
= u．u + v．v + w．w + 2( u．v + u．w + v．w )
= ｜u｜^2 + ｜v｜^2 +｜w｜^2 + 2( u．v + u．w + v．w )
= 4^2 + 2^2 + 1^2 + 2( 3 + 4 - 1 )
= 33
｜u + v + w｜
= √33 ..... Ans
收錄日期: 2021-05-02 14:08:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160513191640AAbe5qX