r12=R1+R2=24+31=55 Ом
r125=r12*R5/(R2+r12)=55*52/(55+52)=26.7 Ом
r1245=R4*r125/(R4+r125)=45*26.7/(45+26.7)=16.8 Ом
общее сопротивление
R=r1245+R3=16.8+38=54.8 ==55 Ом
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r12=R1+R2=24+31=55 Ом
r125=r12*R5/(R2+r12)=55*52/(55+52)=26.7 Ом
r1245=R4*r125/(R4+r125)=45*26.7/(45+26.7)=16.8 Ом
общее сопротивление
R=r1245+R3=16.8+38=54.8 ==55 Ом