Помогите с физикой ))

Question

Помогите с физикой ))

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Answer 1

2/2+4/2=3 Ом    (3)
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Answer 2

  1/R=1/2+1/2=1/4;  R=1;  1/R=1/4+1/4=2/4; R=2 Ом;R=1+2=3 Ом