Выразить R из формулы I=E/R+r
i=(e/R)+r, (i-r)=e/R, R=e/(i-r)
I=E/R+r
R+r=E/I
R=E/I - r
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i=(e/R)+r, (i-r)=e/R, R=e/(i-r)
I=E/R+r
R+r=E/I
R=E/I - r