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I u1 u2 r. U1/u2 r1/r2. R1 r2. R r1+r2 формула. U1=u2=u3 физика. R1=5ом r2=4ом i=2а. R1=1 om r2=2ом r3=3ом i= 2a. R1 r2 r3 r4 4ом u 12в. Дано i 2 а r1 3 ом r2 5ом r3 5 ом. Параллельное соединение r1 r2. I1 i2 i3 формула. U1/u2=i1r1/i2r2. R1 r2 r3 r4 3ом. R1=r4=2ом