U = I2*R2 = 5*6 = 30 В;
I1 = U/R1 = 30/10 = 3 А;
I3 = I - I1 - I2 = 15 - 5 - 3 = 7 А;
R3 = U/I3 = 30/7 = 4,3 Ом
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U = I2*R2 = 5*6 = 30 В;
I1 = U/R1 = 30/10 = 3 А;
I3 = I - I1 - I2 = 15 - 5 - 3 = 7 А;
R3 = U/I3 = 30/7 = 4,3 Ом