(2010年毕节)如图,在平面直角坐标系中,抛物线y=ax2+bx+c(a≠0)的图象与x轴交于点A(-2,0)、B(4,0),与y轴交于点C(0,4),直线l是抛物线的对称轴,与x轴交于点D,点P是直线l上一动点.(1)求此抛物线的表

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