如图,平面直角坐标系中,直线AB:-1/3x+b交y轴于点A(0,1),交x轴于点B.如图,平面直角坐标系中,直线AB:-1/3x+b交y轴于点A(0,1),交x轴于点B.直线x=1交AB于点E.P是直线x=1上一动点,且在点D的上方,设P(1,n)(

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