(R1//R2) nt (R3//R4)
\(R_{12}=\dfrac{R_1R_2}{R_1+R_2}=1,2\Omega\)
\(R_{34}=\dfrac{R_3R_4}{R_3+R_4}=2,4\Omega\\R_{td}=R_{12}+R_{34}=3,6\Omega\\\Rightarrow I_{AB}=\dfrac{U_{AB}}{R_{td}}=\dfrac{18}{3,6}=5A\\ \Rightarrow I_{12}=I_{34}=I_{AB}=5A\\ \Rightarrow\left\{{}\begin{matrix}U_{12}=I_{12}R_{12}=6\Rightarrow U_{12}=U_1=U_2=6V\\U_{34}=I_{34}R_{34}=12\Rightarrow U_{34}=U_3=U_4=12V\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}I_1=\dfrac{U_1}{R_1}=\dfrac{6}{2}=3A\\I_1=\dfrac{U_2}{R_2}=\dfrac{6}{3}=2A\\I_3=\dfrac{U_3}{R_3}=\dfrac{12}{4}=3A\\I_4=\dfrac{U_4}{R_4}=\dfrac{12}{6}=2A\end{matrix}\right.\)
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