Ue=Ie*Re，Uc=Ic*Rc，Ue+Uce+Uc = Ucc；
Ub=Ucc*Rb2/(Rb 1+Rb2)，Ue+Ube = Ub；
Ro=Rc//RL，Ri =(Rb 1//Rb2)//rbe；
au =β* Ro/rbe； Aus=Uo/Us=Au*Ri/(Rs+Ri)
In fact, these textbooks are available, and Baidu also has them. If you are diligent, you will understand them.
Give you a link to a reference web page.
1. In the game, we can find a good position to squat down. It is best to have a bunker next to it, so that you can directly control yo