R=R1+R2 || (R3+R4 || (R5+R6) ) = 3+14 || (10+8 || (2+6) ) = 3+14 || (10+8 || 8 ) = 3+14 || (10+4 ) = 3+14 || 14 = 3+7 = 10 Ом - эквивалентное сопротивление
I6=4А
U6=R6*I6
I5=I6
U5=R5*I5=R5*I6
U4=U5+U6=I6*(R5+R6)
I4=U4/R4=I6*(R5+R6)/R4
I3=I4+I6=I6*(R4+R5+R6)/R4
U3=R3*I3=I6*(R4+R5+R6)*R3/R4
U2=U3+U4=I6*(R4+R5+R6)*R3/R4+I6*(R5+R6)=I6*((R4+R5+R6)*R3/R4+(R5+R6))
I2=U2/R2=I6*((R4+R5+R6)*R3/R4+(R5+R6))/R2
I1=I2+I3=I6*((R4+R5+R6)*R3/R4+(R5+R6))/R2+I6*(R4+R5+R6)/R4=I6*(((R4+R5+R6)*R3/R4+(R5+R6))/R2+(R4+R5+R6)/R4)
U1=I1*R1=I6*R1*(((R4+R5+R6)*R3/R4+(R5+R6))/R2+(R4+R5+R6)/R4)
U=U1+U2=I6*R1*(((R4+R5+R6)*R3/R4+(R5+R6))/R2+(R4+R5+R6)/R4)+I6*((R4+R5+R6)*R3/R4+(R5+R6))=I6*(R1*(((R4+R5+R6)*R3/R4+(R5+R6))/R2+(R4+R5+R6)/R4)+((R4+R5+R6)*R3/R4+(R5+R6)))