$R_5ntR_{10}nt\big([R_6ntR_7ntR_8ntR_9]//[R_3ntR_4nt(R_1//R_2)]\big)$

$R_{tđ}=R_5+R_{10}+\dfrac{(R_6+R_7+R_8+R_9).(R_3+R_4+\dfrac{R_1.R_2}{R_1+R_2})}{R_6+R_7+R_8+R_9+R_3+R_4+\dfrac{R_1.R_2}{R_1+R_2}}$

$⇒R_{tđ}=2+2+\dfrac{(1+1+1+1).(0,5+1+\dfrac{5.5}{5+5})}{1+1+1+1+0,5+1+\dfrac{5.5}{5+5}}=6Ω$

$U_5=10V$

$I_5=\dfrac{U_5}{R_5}=\dfrac{10}{2}=5A$

$I=I_5=I_{10}=5A$

$U_{10}=I_{10}.R_{10}=5.2=10V$

$U_{AB}=I.R_{tđ}=5.6=30V$

$U_6+U_7+U_8+U_9=U_{AB}-U_5-U_{10}=30-10-10=10V$

$U_6=U_7=U_8=U_9=\dfrac{10}{4}=2,5V$

$I_6=I_7=I_8=I_9=\dfrac{U_6}{R_6}=2,5A$

$I_3=I_4=I_5-I_6=5-2,5=2,5A$

$U_3=I_3.R_3=2,5.0,5=1,25V$

$U_4=I_4.R_4=2,5.1=2,5V$

$U_1=U_2=10-U_3-U_4=10-1,25-2,5=6,25V$

$I_1=I_2=\dfrac{U_1}{R_1}=\dfrac{6,25}{5}=1,25A$