\(I=I1=I2=I3=\dfrac{U3}{R3}=\dfrac{7,5}{5}=1,5A\left(R1ntR2ntR3\right)\)
\(\left\{{}\begin{matrix}U=IR=1,5\left(4+3+5\right)=18V\\U1=I1.R1=1,5.4=6V\\U2=I2.R2=1,5.3=4,5V\end{matrix}\right.\)
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