4. 如圖17求流經R1的電流為?
(A)V x R1/(R1R2+R2R3+R3R1)
(B)V x R2/(R1R2+R2R3+R3R1)
(C)V x R3/(R1R2+R2R3+R3R1)
(D)VR2/(R1+R2)R3

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