solvo
I4=U4/R4= 15/3=5 A. I3=I4= 5 A. U3=I3*R3=5*7=35 В. U5=U3+U4=35+15=50 В. I5=U5/R5=50/10= 5 A. I= 5 A. R12=R1*R2/(R1+R2) = 3*5/8=15/8 Ом. U1=U2=U12=I*R12=5*15/8=75/8 В=9,375 В. U=U12+U5=75/8+50=475/5= 95 В. I1=U12/R1=75/(8*3) = 3,125 A. I2=I-I1=5-3,125=1,875 А. R=U/I=95/5=15 Ом.
Answers & Comments
I3=I4= 5 A.
U3=I3*R3=5*7=35 В.
U5=U3+U4=35+15=50 В.
I5=U5/R5=50/10= 5 A.
I= 5 A.
R12=R1*R2/(R1+R2) = 3*5/8=15/8 Ом.
U1=U2=U12=I*R12=5*15/8=75/8 В=9,375 В.
U=U12+U5=75/8+50=475/5= 95 В.
I1=U12/R1=75/(8*3) = 3,125 A.
I2=I-I1=5-3,125=1,875 А.
R=U/I=95/5=15 Ом.