Ask a powerful analog electronics master for the static working point of this problem, but I can't understand the answer. Conditions are given by graphs, and actual values are not required.
1.？ To determine the static operating point of the circuit, first make a DC path:?
2.？ Seek static work
UB=R2/(R2+R3)*VCC
UE=UB-0.7
IEQ=UE/R 1=ICQ
IBQ=ICQ/β
UCEQ=VCC-ICQ*(R 1+R4)