(1/R (общее)) = (1/(R1+R2+R3)) + (1/(R4)) = 1/6 + 1/2 = 2/3
R общее = 1,5 Ом
(1/R (общее)) = (1/(R1+R2)) + (1/(R3+R4)) = 1/3 + 1/7 = 10/21
R (общее) = 21/10 Ом
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(1/R (общее)) = (1/(R1+R2+R3)) + (1/(R4)) = 1/6 + 1/2 = 2/3
R общее = 1,5 Ом
(1/R (общее)) = (1/(R1+R2)) + (1/(R3+R4)) = 1/3 + 1/7 = 10/21
R (общее) = 21/10 Ом