1,IR1+IR2=0.3A2,(U*U/R2)/(U*U/R1)=2,---R1/R2=2------R2=30欧3,U/30+U/60=0.3---------U=(30*60/(30+60))*0.3=6V4,PR2=6*6/30=1.2W
1,R1+R2=300mA