I1=U/R1=24/12=2 A
R23=R2*R3/(R2+R3)=3*6/(3+6)=2 Ом
R234=R23+R4=2+4=6 Ом
I4=U/R234=24/6=4 A
U23=I4*R23=4*2=8 B
I2=U23/R2=8/3=2.7 A
I3=U23/R3=8/6=1.3 A
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Verified answer
I1=U/R1=24/12=2 A
R23=R2*R3/(R2+R3)=3*6/(3+6)=2 Ом
R234=R23+R4=2+4=6 Ом
I4=U/R234=24/6=4 A
U23=I4*R23=4*2=8 B
I2=U23/R2=8/3=2.7 A
I3=U23/R3=8/6=1.3 A
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