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U=60V
U1=36V
I=3A
R1, R2 - ?
I=U/R
R=U/I
R1=U1/I=36V/3A=12Ω
Rz=U/I=60V/3A=20Ω
Rz=R1+R2
R2=Rz-R1=20-12=8Ω