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1/Rz=4*(1/2)
1/Rz=4/2
mnożymy na krzyż
4Rz=2/4
Rz=1/2
Czyli w przypadku 4 oporników:
1/R= 1/2+1/2+1/2+1/2 = 2Ω
1/R=2Ω
czyli R=1/2Ω