R, U, I, I1, I2, I3, U1, U2, U3—?
R1=3 Ом
R2=4 Ом
R3=2 Ом
I1=I=2 A​

R=R1+R2*R3/(R2+R3)=3+4*2/(4+2)=3+8/6=4,33 Ом

U=I*R=2*4,33=8,66 B

I1=I=2 A

U1=I*R1=2*3=6 B

U2=U3=U-U1=8,66-6=2,66 B

I2=U2/R2=2,66/4=0,665 A

I3=I-I2=2-0,665=1,335 A