I=I1+I2=I3=4A
U2=R1*I1=10*4=40B
U=U1+U2+U3=28+40+4=72B
R1=U1:I1=28:4=7Ом
R3=U3:I3=4:4=1Ом
R=R1+R2+R3=7+10+1=18Ом
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I=I1+I2=I3=4A
U2=R1*I1=10*4=40B
U=U1+U2+U3=28+40+4=72B
R1=U1:I1=28:4=7Ом
R3=U3:I3=4:4=1Ом
R=R1+R2+R3=7+10+1=18Ом