U(AB)=36 В R1=5 Ом R2=4 Ом R3=3 Ом R4=6 Ом R5=2 Ом R-? I-?
R=(R1+R2+R3)*R4/(R1+R2+R3+R4)+R5=(5+4+3)*6/(5+4+3+6)+2=12*6/18+2=6 Ом
I=U(AB)/R=36/6=6 A