R1于R2电阻比是5:3 , 电流比=3:5
总电流1A,R2电流=5/8A
等效电阻R=P/I^2=3.84Ω
R1R2并联,等效电阻=R1*R2/(R1+R2)=3.84
R1/R2=5/3
R1=10.24Ω R2=6.144Ω