叉积

 

study from:

https://blog.csdn.net/Puppet__/article/details/76227045

https://www.cnblogs.com/xiexinxinlove/p/3708147.html

https://www.cnblogs.com/aiguona/p/7248311.html

 

 

 

 

posted @ 2018-08-30 12:19  congmingyige  阅读(127)  评论(0编辑  收藏  举报