Ответ:
r=R1*R2/(R1+R2) = 20*80 / (20+80)=16 Ом
I=U/r=48/16=3 A
U3=I*R3=3*5 =15 В
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Ответ:
r=R1*R2/(R1+R2) = 20*80 / (20+80)=16 Ом
I=U/r=48/16=3 A
U3=I*R3=3*5 =15 В