(2012•河南)如图,在平面直角坐标系中,直线y= 1/2x+1(变式题)(2012•河南)如图,在平面直角坐标系中,直线y= 1/2x+1与抛物线y=ax2+bx-3交于A、B两点,点A在x轴上,点B的纵坐标为3.点P是直

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