1/R1+2=1/R1+1/R2=R2+R1/R1R2 => R1+2=R1R2/R1+R2=15*20/15+20=300/35~8,6 Ом.
R3=U/I=18/6=3 Ом => R=R1+2+R3=8,6+3=11,6 Ом.
Вiдповiдь: 11,6 Ом.
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1/R1+2=1/R1+1/R2=R2+R1/R1R2 => R1+2=R1R2/R1+R2=15*20/15+20=300/35~8,6 Ом.
R3=U/I=18/6=3 Ом => R=R1+2+R3=8,6+3=11,6 Ом.
Вiдповiдь: 11,6 Ом.