wxsh.net
当前位置:首页>>关于》b的资料>>

》b

可以看作是 a::(b():c),就简化了

首先题中B有意义:2m-1

A+B =180° A= 180°-B cosA =cos(180°-B) =-cosB cosA +cosB =0

网站首页 | 网站地图
All rights reserved Powered by www.wxsh.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com