Y->Δ :(Y形电阻两两乘积之和）/(Y形不相邻电阻）,即：R12=(R1R2+R2R3+R1R3)/R3 R23=(R1R2+R2R3+R1R3)/R1 R13=(R1R2+R2R3+R1R3)/R2 Δ->Y ：Δ形相邻电阻之乘积/Δ形电阻之和,即：R1=R12*R13/(R12+R13+R23) R2=R12*R...