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1/Rr=1*R20/R1*R20 + R1*1/R20*R1
1/Rr=R20/R1*R20 + R1/R20*R1
1/Rr=R20+R1/R20*R1
Rr=R20*R1/R20+R1
Rr=20*1/20+1
Rr=20/21 ≈ 0,95 [om]- wstaw sobie znaczek oma