看來你的題目是長這個樣子,這還要看5V的電流供電能力,假設是供5V2A、負載固定為X,那麼I1=2*(R2+R3+R4+R5+4*X)/(R1+R2+R3+R4+R5+5*X)I2=2*(R1+R3+R4+R5+4*X)/(R1+R2+R3+R4+R5+5*X)I3=2*(R1+R2+R4+R5+4*X)/(R1+R2+R3+R4+R5+5*X)I4=2*(R1+R2+R3+R5+4*X)/(R1+R2+R3+R4+R5+5*X)I5=2*(R1+R2+R3+R4+4*X)/(R1+R2+R3+R4+R5+5*X)4.5=I1*(R1+X)4=I2*(R2+X)3.5=I3*(R3+X)3=I4*(R4+X)2.5=I5*(R5+X)解聯立方程式,五個方程式求五個解。