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U=IR=0.15(R1+60)=0.15(R1+60)② 解①②方程组得：U=18VR1=60欧  (3)由P=U2/R知，U一定，R最小，则P最大，而P在A处时R2最小此时R=R1=60 P最大=U2/R=182/60=5.4W (责任编辑：admin) |