2) R=R1+R2*R3*R4/(R2*R3+R3*R4+R2*R4)+R5=4+5*10*30/(5*10+10*30+5*30)+3 = 7+1500/500=7+3=10 Ом
I=Uаб/R=40/10=4 A
3) R=(R1+R2)*R3/(R1+R2+R3)+R4+R5=(20+30)*50/(20+30+50)+15+10= 2500/100+15+10=25+15+10=50 Ом
I=Uаб/R=100/50=2 A
4) R=R1+(R2+R3)*(R4+R5)/(R2+R3+R4+R5)=1+(6+6)*(5+7)/(6+6+5+7)= 1+144/24= 1+6=7 Ом
I=Uаб/R=42/7=6 A
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2) R=R1+R2*R3*R4/(R2*R3+R3*R4+R2*R4)+R5=4+5*10*30/(5*10+10*30+5*30)+3 = 7+1500/500=7+3=10 Ом
I=Uаб/R=40/10=4 A
3) R=(R1+R2)*R3/(R1+R2+R3)+R4+R5=(20+30)*50/(20+30+50)+15+10= 2500/100+15+10=25+15+10=50 Ом
I=Uаб/R=100/50=2 A
4) R=R1+(R2+R3)*(R4+R5)/(R2+R3+R4+R5)=1+(6+6)*(5+7)/(6+6+5+7)= 1+144/24= 1+6=7 Ом
I=Uаб/R=42/7=6 A