I=I1=I2=I3 =0.5A
R2=U2/I=6/0.5=12 Ом
Rob=R1+R2+R3 = R1+R2+3*R1 = R2+4R1
Rob=Uob/I=24/0.5= 48 Ом
Rob = R2+4R1
48=12+4R1
R1=9 Ом
R3=R1*3=9*3=27 Ом
I=I1=I2=I3 =0.5A
R2=U2/I=6/0.5=12 Ом
Rob=R1+R2+R3 = R1+R2+3*R1 = R2+4R1
Rob=Uob/I=24/0.5= 48 Ом
Rob = R2+4R1
48=12+4R1
R1=9 Ом
R3=R1*3=9*3=27 Ом