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2 równolegle
Rz1=R^2/2R=R/2
3 równolegle
1/Rz3=1/R+1/R+1/R=1/R(1+1+1)=3/R
Rz3=R/3
cały układ szeregowo
Rz=Rz1+R+Rz3=R/2+R+R/3=R(1/2+1+1/3)=R(3/6+6/6+2/6)
Rz=11R/6=11*3/6=11/2=5,5 Ω