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R₂ = 3Ω
Rz - oporność zastępcza
1/Rz = 1/R₁ + 1/R₂
1/Rz = (R₂ + R₁)/R₁R₂
Rz = R₁R₂/(R₂ + R₁) = 6 razy 3 dzielone przez 3 + 6 = 18/9 = 2Ω
odp. 2 Ω