I1=U/R1=12/500=0,024 A
I2=I3=U/(R2+R3)=12/(500+500)=12/1000=0,012 A
I4=U/R4=12/500=0,024 A
R=U/I=U/(I1+I2+I4)=12/(0,024+0,012+0,024)=200 Ом
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I1=U/R1=12/500=0,024 A
I2=I3=U/(R2+R3)=12/(500+500)=12/1000=0,012 A
I4=U/R4=12/500=0,024 A
R=U/I=U/(I1+I2+I4)=12/(0,024+0,012+0,024)=200 Ом