Ответы и объяснения

2014-03-19T18:41:07+04:00
R1//R2
R'=R1*R2/(R1+R2)=18/9=2OM
R''=R'+R3=2+2=4OM
R'''=R''*R4/(R'''+R4)=48/16=3OM

R=R'''*R5/(R'''+R5)=18/9=2OM
I=U/R=18/2=9A