R12=R1+R2
R123=R12*R3/(R12+R3)
R12345=R123+R4+R5
U=I*R12345
I4=I5=I123=I
U4=I*R4
U5=I*R5
U12=U3=U-U4-U5
I1=I2=U12/R12
U1=I1*R1
U2=I2*R2
I3=I-I1=U3/R3
R12=R1+R2
R123=R12*R3/(R12+R3)
R12345=R123+R4+R5
U=I*R12345
I4=I5=I123=I
U4=I*R4
U5=I*R5
U12=U3=U-U4-U5
I1=I2=U12/R12
U1=I1*R1
U2=I2*R2
I3=I-I1=U3/R3