R=R1*R2/(R1+R2)+R3=R1*R2/(R1+R2)+U/I=5*15/(5+15)+12/4=3,75+3=6,75 Ом
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R=R1*R2/(R1+R2)+R3=R1*R2/(R1+R2)+U/I=5*15/(5+15)+12/4=3,75+3=6,75 Ом