(1),IBQ=(VCC-UCE)/RB=11.3/280K≈40uA ICQ=IBQ*β=2.4mA VCEQ=VCC-ICQRC=12V-2.4mA*3K=4.8V(2),Au≈-βRC/rbe(3),Ri=RB//rbe(4),Ro=RC
