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R=1+2+4
R=7 ohm
2) 1/R=1/R2+1/R2
R=R1`*R2/(R1+R2)
R=2*2/4
R= 1 ohm
3) Oblicz opór całkowity układu oporników, gdzie R₁= 2
R²=2 R³=4 R⁴=4. - podaj schemat - dam odp.